Overview
Pipelined I2C code
Modules
I2C Master
Parameters
| Name | Description |
|---|---|
Address |
Address for the Slave. |
PipeSpec |
specification of the data coming in and out of the module. |
ClockCount |
Number of clock ticks for each bit (@ 48MHz for 400kbps, count is 48M/400K = 120 ) |
Ports
| Name | Direction | Size | Description |
|---|---|---|---|
clock |
In | 1 | System clock |
reset |
In | 1 | System reset |
slave_address |
In | n | Slave Address , -1 if in-pipe instead |
read_count |
In | n+1 | Words to read, -1 if in-pipe |
operation |
In | 1 | Operation, 0 write, 1 read, 2 write-read, -1 specified in pipe |
send_address |
In | 1 | send address as part of the return message |
send_operation |
In | 1 | send operation as part of the return message |
send_write_count |
In | 1 | send write count as part of the return message |
read_start |
In | 1 | Start operation |
complete |
Out | 1 | Operation complete |
error |
Out | 1 | Operation failed |
write_count |
Out | n | Words written |
pipe_in |
InOut | p | Pipeline of messages to be sent |
pipe_out |
InOut | p | Pipeline of messages received |
scl |
InOut | 1 | Communication clock clock out. Open Drain Output |
sda |
InOut | 1 | Communication data in and out. Open Drain Output |
Dependencies
| Subsystem | File |
|---|---|
| Pipe | pipe_defs.v |
| pipe_utils.v |
Template
i2c_master #(
.PipeSpec( PipeSpec ),
.ClockCount( ClockCount )
) i2c_m(
.clock( clock ),
.reset( reset ),
.pipe_in( pipe_in ),
.pipe_out( pipe_out ),
.scl( scl ),
.sda( sda )
);
I2C Slave
Parameters
| Name | Description |
|---|---|
Address |
Slave Address. |
PipeSpec |
specification of the data coming in and out of the module. |
ClockCount |
clock ticks per bit |
Ports
| Name | Direction | Size | Description |
|---|---|---|---|
clock |
In | 1 | System clock |
reset |
In | 1 | System reset |
pipe_in |
InOut | p | Pipeline of messages to be sent |
pipe_out |
InOut | p | Pipeline of messages received |
scl |
In | 1 | Communication clock in |
sda |
In | n | Communication data in |
Dependencies
Pipe
- pipe_defs.v
- pipe_utils.v
Template
Waveforms
Tasks
More doc
Timeouts for clock stretching (else?)
Write-Read mode
More hardware testing
Discussions
How to handle Read length in a pipeline environment?
Same as SPI with header or input options for read/write read count
ADDRESS
READ COUNT n = 0
WRITE DATA 0
...
WRITE DATA m
ADDRESS
READ COUNT n =/= 0
Should address be added to the return?
Yes, optionally.