Flow
Specification
The Flow interface is a simple valid/payload protocol which mean the slave can’t halt the bus.
It could be used, for example, to represent data coming from an UART controller, requests to write an on-chip memory, etc.
Signal |
Type |
Driver |
Description |
Don’t care when |
|---|---|---|---|---|
valid |
Bool |
Master |
When high => payload present on the interface |
|
payload |
T |
Master |
Content of the transaction |
valid is low |
Functions
Syntax |
Description |
Return |
Latency |
|---|---|---|---|
Flow(type : Data) |
Create a Flow of a given type |
Flow[T] |
|
master/slave Flow(type : Data) |
Create a Flow of a given type
Initialized with corresponding in/out setup
|
Flow[T] |
|
x.m2sPipe() |
Return a Flow drived by x
through a register stage that cut valid/payload paths
|
Flow[T] |
1 |
x << y
y >> x
|
Connect y to x |
0 |
|
x <-< y
y >-> x
|
Connect y to x through a m2sPipe |
1 |
|
x.throwWhen(cond : Bool) |
Return a Flow connected to x
When cond is high, transaction are dropped
|
Flow[T] |
0 |
x.toReg() |
Return a register which is loaded with |
T |