PM7366-PI datasheet(60/286 Pages) PMC

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PM7366 FREEDM-8

DATA SHEET

PMC-1970930

ISSUE 4

FRAME ENGINE AND DATA LINK MANAGER

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ 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 10 – 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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