RegIf
寄存器接口搭建器
自动寻址、字段分配和冲突检测
28种寄存器访问类型(涵盖UVM标准定义的25种类型)
自动生成文档
自动分配
自动地址分配
class RegBankExample extends Component {
val io = new Bundle {
apb = slave(Apb3(Apb3Config(16,32)))
}
val busif = Apb3BusInterface(io.apb,(0x0000, 100 Byte))
val M_REG0 = busif.newReg(doc="REG0")
val M_REG1 = busif.newReg(doc="REG1")
val M_REG2 = busif.newReg(doc="REG2")
val M_REGn = busif.newRegAt(address=0x40, doc="REGn")
val M_REGn1 = busif.newReg(doc="REGn1")
busif.accept(HtmlGenerator("regif", "AP"))
// busif.accept(CHeaderGenerator("header", "AP"))
// busif.accept(JsonGenerator("regif"))
// busif.accept(RalfGenerator("regbank"))
// busif.accept(SystemRdlGenerator("regif", "AP"))
}
Automatic filed allocation
val M_REG0 = busif.newReg(doc="REG1")
val fd0 = M_REG0.field(Bits(2 bit), RW, doc= "fields 0")
M_REG0.reserved(5 bits)
val fd1 = M_REG0.field(Bits(3 bit), RW, doc= "fields 0")
val fd2 = M_REG0.field(Bits(3 bit), RW, doc= "fields 0")
// auto reserved 2 bits
val fd3 = M_REG0.fieldAt(pos=16, Bits(4 bit), doc= "fields 3")
// auto reserved 12 bits
冲突检测
val M_REG1 = busif.newReg(doc="REG1")
val r1fd0 = M_REG1.field(Bits(16 bits), RW, doc="fields 1")
val r1fd2 = M_REG1.field(Bits(18 bits), RW, doc="fields 1")
...
cause Exception
val M_REG1 = busif.newReg(doc="REG1")
val r1fd0 = M_REG1.field(Bits(16 bits), RW, doc="fields 1")
val r1fd2 = M_REG1.fieldAt(pos=10, Bits(2 bits), RW, doc="fields 1")
...
cause Exception
28种访问类型
其中大部分来自UVM规范
访问类型 |
描述 |
来源 |
---|---|---|
RO |
w:无影响,r:无影响 |
UVM |
RW |
w:保持原样,r:无影响 |
UVM |
RC |
w:无影响,r:清除所有比特 |
UVM |
RS |
w:无影响,r:置位所有比特 |
UVM |
WRC |
w:保持原样,r:清除所有比特 |
UVM |
WRS |
w:保持原样,r:置位所有比特 |
UVM |
WC |
w:清除所有比特,r:无影响 |
UVM |
WS |
w:置位所有比特,r:无影响 |
UVM |
WSRC |
w:置位所有比特,r:清除所有比特 |
UVM |
WCRS |
w:清除所有比特,r:置位所有比特 |
UVM |
W1C |
w:1/0 对匹配位清除/无影响,r:无影响 |
UVM |
W1S |
w:1/0 对匹配位置位/无影响,r:无影响 |
UVM |
W1T |
w:1/0 对匹配位翻转/无影响,r:无影响 |
UVM |
W0C |
w:1/0 对匹配位清除/无影响,r:无影响 |
UVM |
W0S |
w:1/0 对匹配位置位/无影响,r:无影响 |
UVM |
W0T |
w:1/0 对匹配位翻转/无影响,r:无影响 |
UVM |
W1SRC |
w:1/0 对匹配位置位/无影响,r:清除所有比特 |
UVM |
W1CRS |
w:1/0 对匹配位清除/无影响,r:置位所有比特 |
UVM |
W0SRC |
w:1/0 对匹配位置位/无影响,r:清除所有比特 |
UVM |
W0CRS |
w:1/0 对匹配位清除/无影响,r:置位所有比特 |
UVM |
WO |
w:保持原样,r:错误 |
UVM |
WOC |
w:清除所有比特,r:错误 |
UVM |
WOS |
w:置位所有比特,r:错误 |
UVM |
W1 |
w:硬复位后第一个w保持原样,其他w无影响,r:无影响 |
UVM |
WO1 |
w:硬复位后第一个w保持原样,其他w无影响,r:错误 |
UVM |
NA |
w:保留,r:保留 |
新的 |
W1P |
w:1/0 对匹配位脉冲(pulse)/无影响,r:无影响 |
新的 |
W0P |
w:0/1 对匹配位脉冲(pulse)/无影响,r:无影响 |
新的 |
HSRW |
w:硬件置位,软件RW |
新的 |
RWHS |
w:软件RW、硬件置位 |
新的 |
ROV |
w:只读值,用于硬件版本 |
新的 |
CSTM |
w:用户自定义类型,用于文档 |
新的 |
自动生成文档
文档类型
文档类型 |
用法 |
状态 |
---|---|---|
HTML |
|
Y |
CHeader |
|
Y |
JSON |
|
Y |
RALF(UVM) |
|
Y |
SystemRDL |
|
Y |
Latex(pdf) |
N |
|
docx |
N |
HTM 自动文档现已完成,源代码示例:
生成的 HTML 文档:
特殊访问用途
案例1: RO
用法
RO
与其他类型不同。它不创建寄存器,需要外部信号来驱动它,注意,请不要忘记驱动它。
val io = new Bundle {
val cnt = in UInt(8 bit)
}
val counter = M_REG0.field(UInt(8 bit), RO, 0, "counter")
counter := io.cnt
val xxstate = M_REG0.field(UInt(8 bit), RO, 0, "xx-ctrl state").asInput
val overflow = M_REG0.field(Bits(32 bit), RO, 0, "xx-ip parameter")
val ovfreg = Reg(32 bit)
overflow := ovfreg
val inc = in Bool()
val counter = M_REG0.field(UInt(8 bit), RO, 0, "counter")
val cnt = Counter(100, inc)
counter := cnt
案例2: ROV
用法
ASIC设计常常需要一些固化的版本信息。与 RO 不同,它不会产生有线信号
旧方法:
val version = M_REG0.field(Bits(32 bit), RO, 0, "xx-device version")
version := BigInt("F000A801", 16)
新方法:
M_REG0.field(Bits(32 bit), ROV, BigInt("F000A801", 16), "xx-device version")(Symbol("Version"))
案例3: HSRW/RWHS
在某些情况下的硬件设置类型,此类寄存器不仅可以由软件配置,还可以由硬件信号设置
val io = new Bundle {
val xxx_set = in Bool()
val xxx_set_val = in Bits(32 bit)
}
val reg0 = M_REG0.fieldHSRW(io.xxx_set, io.xxx_set_val, 0, "xx-device version") // 0x0000
val reg1 = M_REG1.fieldRWHS(io.xxx_set, io.xxx_set_val, 0, "xx-device version") // 0x0004
always @(posedge clk or negedge rstn)
if(!rstn) begin
reg0 <= '0;
reg0 <= '0;
end else begin
if(hit_0x0000) begin
reg0 <= wdata ;
end
if(io.xxx_set) begin // HW have High priority than SW
reg0 <= io.xxx_set_val ;
end
if(io.xxx_set) begin
reg1 <= io.xxx_set_val ;
end
if(hit_0x0004) begin // SW have High priority than HW
reg1 <= wdata ;
end
end
案例4: CSTM
虽然SpinalHDL包含25种寄存器类型和6种扩展类型,但在实际应用中仍然对私有寄存器类型有各种需求。因此,我们保留CSTM类型以实现可扩展性。 CSTM仅用于生成软件接口,不生成实际电路
val reg = Reg(Bits(16 bit)) init 0
REG.registerAtOnlyReadLogic(0, reg, CSTM("BMRW"), resetValue = 0, "custom field")
when(busif.dowrite) {
reg := reg & ~busif.writeData(31 downto 16) | busif.writeData(15 downto 0) & busif.writeData(31 downto 16)
}
案例5: parasiteField
这用于软件在多个地址上共享同一寄存器,而不是生成多个寄存器实体
示例1:时钟门软件使能
val M_CG_ENS_SET = busif.newReg(doc="Clock Gate Enables") // x00000
val M_CG_ENS_CLR = busif.newReg(doc="Clock Gate Enables") // 0x0004
val M_CG_ENS_RO = busif.newReg(doc="Clock Gate Enables") // 0x0008
val xx_sys_cg_en = M_CG_ENS_SET.field(Bits(4 bit), W1S, 0, "clock gate enables, write 1 set" )
M_CG_ENS_CLR.parasiteField(xx_sys_cg_en, W1C, 0, "clock gate enables, write 1 clear" )
M_CG_ENS_RO.parasiteField(xx_sys_cg_en, RO, 0, "clock gate enables, read only"
example2: interrupt raw reg with force interface for software
val RAW = this.newRegAt(offset,"Interrupt Raw status Register\n set when event \n clear raw when write 1")
val FORCE = this.newReg("Interrupt Force Register\n for SW debug use \n write 1 set raw")
val raw = RAW.field(Bool(), AccessType.W1C, resetValue = 0, doc = s"raw, default 0" )
FORCE.parasiteField(raw, AccessType.W1S, resetValue = 0, doc = s"force, write 1 set, debug use" )
案例6: SpinalEnum
当字段类型为 SpinalEnum 时,resetValue 指定枚举元素的索引。
object UartCtrlTxState extends SpinalEnum(defaultEncoding = binaryOneHot) {
val sIdle, sStart, sData, sParity, sStop = newElement()
}
val raw = M_REG2.field(UartCtrlTxState(), AccessType.RW, resetValue = 2, doc="state")
// raw will be init to sData
字节掩码
withStrb
典型例子
批量创建REG-Address和字段寄存器
import spinal.lib.bus.regif._
class RegBank extends Component {
val io = new Bundle {
val apb = slave(Apb3(Apb3Config(16, 32)))
val stats = in Vec(Bits(16 bit), 10)
val IQ = out Vec(Bits(16 bit), 10)
}
val busif = Apb3BusInterface(io.apb, (0x000, 100 Byte), regPre = "AP")
(0 to 9).map { i =>
// here use setName give REG uniq name for Docs usage
val REG = busif.newReg(doc = s"Register${i}").setName(s"REG${i}")
val real = REG.field(SInt(8 bit), AccessType.RW, 0, "Complex real")
val imag = REG.field(SInt(8 bit), AccessType.RW, 0, "Complex imag")
val stat = REG.field(Bits(16 bit), AccessType.RO, 0, "Accelerator status")
io.IQ(i)( 7 downto 0) := real.asBits
io.IQ(i)(15 downto 8) := imag.asBits
stat := io.stats(i)
}
def genDocs() = {
busif.accept(CHeaderGenerator("regbank", "AP"))
busif.accept(HtmlGenerator("regbank", "Interupt Example"))
busif.accept(JsonGenerator("regbank"))
busif.accept(RalfGenerator("regbank"))
busif.accept(SystemRdlGenerator("regbank", "AP"))
}
this.genDocs()
}
SpinalVerilog(new RegBank())
中断生成器
手动写中断
class cpInterruptExample extends Component {
val io = new Bundle {
val tx_done, rx_done, frame_end = in Bool()
val interrupt = out Bool()
val apb = slave(Apb3(Apb3Config(16, 32)))
}
val busif = Apb3BusInterface(io.apb, (0x000, 100 Byte), regPre = "AP")
val M_CP_INT_RAW = busif.newReg(doc="cp int raw register")
val tx_int_raw = M_CP_INT_RAW.field(Bool(), W1C, doc="tx interrupt enable register")
val rx_int_raw = M_CP_INT_RAW.field(Bool(), W1C, doc="rx interrupt enable register")
val frame_int_raw = M_CP_INT_RAW.field(Bool(), W1C, doc="frame interrupt enable register")
val M_CP_INT_FORCE = busif.newReg(doc="cp int force register\n for debug use")
val tx_int_force = M_CP_INT_FORCE.field(Bool(), RW, doc="tx interrupt enable register")
val rx_int_force = M_CP_INT_FORCE.field(Bool(), RW, doc="rx interrupt enable register")
val frame_int_force = M_CP_INT_FORCE.field(Bool(), RW, doc="frame interrupt enable register")
val M_CP_INT_MASK = busif.newReg(doc="cp int mask register")
val tx_int_mask = M_CP_INT_MASK.field(Bool(), RW, doc="tx interrupt mask register")
val rx_int_mask = M_CP_INT_MASK.field(Bool(), RW, doc="rx interrupt mask register")
val frame_int_mask = M_CP_INT_MASK.field(Bool(), RW, doc="frame interrupt mask register")
val M_CP_INT_STATUS = busif.newReg(doc="cp int state register")
val tx_int_status = M_CP_INT_STATUS.field(Bool(), RO, doc="tx interrupt state register")
val rx_int_status = M_CP_INT_STATUS.field(Bool(), RO, doc="rx interrupt state register")
val frame_int_status = M_CP_INT_STATUS.field(Bool(), RO, doc="frame interrupt state register")
rx_int_raw.setWhen(io.rx_done)
tx_int_raw.setWhen(io.tx_done)
frame_int_raw.setWhen(io.frame_end)
rx_int_status := (rx_int_raw || rx_int_force) && (!rx_int_mask)
tx_int_status := (tx_int_raw || rx_int_force) && (!rx_int_mask)
frame_int_status := (frame_int_raw || frame_int_force) && (!frame_int_mask)
io.interrupt := rx_int_status || tx_int_status || frame_int_status
}
这是一项非常繁琐且重复的工作,更好的方法是使用“生成器(factory)”范例来自动生成每个信号的文档。
现在InterruptFactory可以做到这一点。
创建中断的简单方法:
class EasyInterrupt extends Component {
val io = new Bundle {
val apb = slave(Apb3(Apb3Config(16,32)))
val a, b, c, d, e = in Bool()
}
val busif = BusInterface(io.apb,(0x000,1 KiB), 0, regPre = "AP")
busif.interruptFactory("T", io.a, io.b, io.c, io.d, io.e)
busif.accept(CHeaderGenerator("intrreg","AP"))
busif.accept(HtmlGenerator("intrreg", "Interupt Example"))
busif.accept(JsonGenerator("intrreg"))
busif.accept(RalfGenerator("intrreg"))
busif.accept(SystemRdlGenerator("intrreg", "AP"))
}
IP级中断生成器
寄存器 |
访问类型 |
描述 |
---|---|---|
RAW |
W1C |
中断原始状态(int raw)寄存器,由int事件设置,总线写1时清零 |
FORCE |
RW |
中断强制寄存器,用于软件调试 |
MASK |
RW |
int mask register, 1: off; 0: open; default 1 int off |
STATUS |
RO |
中断状态,只读, |
Spinal用法:
busif.interruptFactory("T", io.a, io.b, io.c, io.d, io.e)
SYS级中断合并
寄存器 |
访问类型 |
描述 |
---|---|---|
MASK |
RW |
int mask register, 1: off; 0: open; default 1 int off |
STATUS |
RO |
中断状态,RO, |
Spinal用法:
busif.interruptLevelFactory("T", sys_int0, sys_int1)
Spinal的生成器
总线接口方法 |
描述 |
---|---|
|
为脉冲事件创建RAW/FORCE/MASK/STATUS |
|
为脉冲事件创建RAW/MASK/STATUS |
|
为level_int合并创建MASK/STATUS |
|
在addrOffset处为脉冲事件创建RAW/FORCE/MASK/STATUS |
|
在addrOffset处为脉冲事件创建 RAW/MASK/STATUS |
|
在addrOffset处为level_int合并创建MASK/STATUS |
|
create RAW/FORCE/MASK(SET/CLR)/STATUS for pulse event at addrOffset |
|
create RAW/FORCE/MASK(SET/CLR)/STATUS for level event at addrOffset |
示例
class RegFileIntrExample extends Component {
val io = new Bundle {
val apb = slave(Apb3(Apb3Config(16,32)))
val int_pulse0, int_pulse1, int_pulse2, int_pulse3 = in Bool()
val int_level0, int_level1, int_level2 = in Bool()
val sys_int = out Bool()
val gpio_int = out Bool()
}
val busif = BusInterface(io.apb, (0x000,1 KiB), 0, regPre = "AP")
io.sys_int := busif.interruptFactory("SYS",io.int_pulse0, io.int_pulse1, io.int_pulse2, io.int_pulse3)
io.gpio_int := busif.interruptLevelFactory("GPIO",io.int_level0, io.int_level1, io.int_level2, io.sys_int)
def genDoc() = {
busif.accept(CHeaderGenerator("intrreg","Intr"))
busif.accept(HtmlGenerator("intrreg", "Interrupt Example"))
busif.accept(JsonGenerator("intrreg"))
busif.accept(RalfGenerator("intrreg"))
busif.accept(SystemRdlGenerator("intrreg", "Intr"))
this
}
this.genDoc()
}
默认读取值
当软件读取保留地址时,当前的策略是正常返回,readerror=0。为了方便软件调试,可以配置回读值,默认为0
busif.setReservedAddressReadValue(0x0000EF00)
default: begin
busif_rdata <= 32'h0000EF00 ;
busif_rderr <= 1'b0 ;
end
开发者区域
You can add your document Type by extending the BusIfVisitor Trait
case class Latex(fileName : String) extends BusIfVisitor{ ... }
BusIfVisitor give access BusIf.RegInsts to do what you want
// lib/src/main/scala/spinal/lib/bus/regif/BusIfBase.scala
trait BusIfVisitor {
def begin(busDataWidth : Int) : Unit
def visit(descr : FifoDescr) : Unit
def visit(descr : RegDescr) : Unit
def end() : Unit
}