PM7364 datasheet(60/325 Pages) PMC

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PM7364 FREEDM-32

DATA SHEET

PMC-1960758

ISSUE 6

FRAME ENGINE AND DATA LINK MANAGER

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMER’S INTERNAL USE

Figure 8 – Receive Channel Descriptor Reference Table

RPD Pointer[13:0]

Bytes Available in Buffer[15:0]

Start RPD Pointer[13:0]

DMA Current Address[31:0]

RBC[1:0]

Bit 0

Bit 31

RCC 0

RCC 1

RCC 127

RPD Pointer[13:0]

Bytes Available in Buffer[15:0]

Start RPD Pointer[13:0]

DMA Current Address[31:0]

RPD Pointer[13:0]

Bytes Available in Buffer[15:0]

Start RPD Pointer[13:0]

DMA Current Address[31:0]

RBC[1:0]

Buffer Size[15:0]

Res

Table 8 – Receive Channel Descriptor Reference Table Fields

Field

Description

Bytes Available in

Buffer[15:0]

This field is used to keep track of the number of bytes

available in the current data buffer. The RMAC initialises

the Bytes Available in Buffer to the Receive Buffer Size

minus the offset at the head of the buffer. The field is

decremented each time a byte is written into the buffer.

RBC[1:0]

This field is used to keep track of the number of buffers

used when storing ‘raw’ (i.e. non packet delimited) data.

The RMAC initialises the RBC field to the value of the

RAWMAX[1:0] field in the RMAC Control Register. The

field is decremented each time a buffer is filled with

data. If the field reaches zero, the chain of RPDs is

placed on the ready queue and a new chain started.

RPD Pointer[13:0]

This field contains the pointer to the current RPD.

Buffer Size[15:0]

This field contains the size in bytes of the buffer

currently being written to.

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