PM7367 datasheet(58/323 Pages) PMC

номер детали	PM7367

подробное описание детали	FRAME ENGINE AND DATA LINK MANAGER

PDF	323 Pages

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производитель	PMC [PMC-Sierra, Inc]

домашняя страница	http://www.pmc-sierra.com

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PM7367 FREEDM-32P32

DATA SHEET

PMC-1991499

ISSUE 2

FRAME ENGINE AND DATA LINK MANAGER

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

Although a STATUS+RPDR only totals to 16 bits, each queue entry is a dword,

i.e. 32 bits. When the RMAC block writes a STATUS+RPDR to the ready queue,

it sets the third byte to 0 and the fourth (most significant) byte is unmodified.

Figure 7 – RPDRR Queue Operation

Rx Packet Descriptor Reference Ready Queue

Bit 0

Bit 31

STATUS + RPDR

RPDRRQ_START_ADDR

RPDRRQ_END_ADDR

RPDRRQ_READ_ADDR

RPDRRQ_WRITE_ADDR

STATUS + RPDR

RPD - 16 bytes

buffer

-packet M

buffer

-packet N

buffer

-start of

packet O

buffer

-middle of

packet O

buffer

-end of

packet O

Receive Channel Descriptor Reference Table

On a per-channel basis, the RMAC caches information such as the current DMA

information in a Receive Channel Descriptor Reference (RCDR) Table. The

RMAC can process 32 channels and stores three dwords of information per

channel. This information is cached internally in order to decrease the number

of host bus accesses required to process each data packet. The structure of the

RCDR table is shown in Figure 8.

PM7367 датащи(PDF) 58 Page - PMC-Sierra, Inc