PM7367 datasheet(72/323 Pages) PMC

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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

Figure 11 – Transmit Descriptor Table

TDTB[31:4] = Tx Descriptor Table Base register

TDR[13:0] = Transmit Descriptor Reference

TD_ADDR[31:0] = Transmit Descriptor Address

TDTB

Bit 0

Bit 31

TD_ADDR

TD1

TD2

TD 16384

Dword 0

Dword 1

Dword 2

Dword 3

TDTB[31:4]

TDR[13:0]

Bit 31

Bit 0

TD_ADDR[31:0]

Dword 0

0000

Dword 3

Transmit Queues

Pointers to the transmit descriptors (TDs) containing packet(s) ready for

transmission are passed from the host to the TMAC using the Transmit

Descriptor Reference Ready (TDRR) queue, which resides in host memory.

Pointers to transmit descriptor structures whose buffers have been read by the

TMAC are passed from the TMAC to the host using the Transmit Descriptor

Reference Free (TDRF) queue, which also resides in host memory. The TMAC

contains a Free Queue cache which can store up to six TDRs. If caching is

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