PM7385 datasheet(60/244 Pages) PMC

60 / 244 page

PM7385 FREEDM-84A672

DATA SHEET

PMC-1990114

ISSUE 6

84 LINK, 672 CHANNEL FRAME ENGINE AND DATA LINK MANAGER

WITH ANY-PHY PACKET INTERFACE

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

and the 10 least significant bits of the poll address for identification of a channel.

The TAPI672 provides three poll results for every poll address according to Table

9. The TPAn[0] bit indicates whether or not space exists in the channel FIFO for

data and the TPAn[1] bit indicates whether or not that polled channel FIFO is at

risk of underflowing and should be provided data soon. The TPAn[2] bit indicates

that an underflow event has occurred on that channel FIFO.

Table 9 – Transmit Polling

Poll

Address

TPA1[0]

(Full/Space)

TPA1[1]

(Space/Starving)

TPA1[2]

(Underflow)

TPA2[0]

(Full/Space)

TPA2[1]

(Space/Starving)

TPA2[2]

(Underflow)

Channel 0 Channel 0

Channel 0

Channel 0 Channel 1

Channel 1

Channel 1 Channel 1

Channel 1

Channel 1 Channel 2

Channel 2

Channel 2 Channel 2

Channel 2

Channel 2 Channel 3

Channel 3

Channel 3 Channel 3

Channel 3

Channel 3 Channel 4

Channel 4

Channel 4 Channel 4

Channel 4

Channel 4 Channel 5

Channel 5

Channel 5 Channel 5

Channel 5

Channel 5 Channel 6

Channel 6

Channel 6 Channel 6

Channel 6

Channel 6 Channel 7

Channel 7

Channel 7 Channel 7

Channel 7

Channel 7 Channel 8

Channel 8

Channel 8 Channel 8

Channel 8

Channel 8 Channel 9

Channel 9

Channel

671

Channel

671

Channel

671

Channel

671

Channel 0

The TAPI672 maintains a mirror image of the status of each channel FIFO in the

partial packet buffer. The THDL672 continuously reports the status of the 672

channel FIFOs to the TAPI672 and the TAPI672 updates the mirror image

accordingly. The THDL672 also signals to the TAPI672 whenever an underflow

event has occurred on a channel FIFO. At the beginning of every data transfer

across the Tx APPI, the TAPI672 sets the mirror image status of the channel to

“full”. Only the TAPI672 can cause the status to be set to “full” and only the

THDL672 can cause the status to be set to “space” or “starving”. Only the

THDL672 can cause the status to be set to “underflow” and only the TAPI672 can

clear the “underflow” status when that channel FIFO is polled. In the event that

both the TAPI672 and the THDL672 try to change the mirror image status of a

particular channel simultaneously, the TAPI672 takes precedence, except for the

“underflow” status, where the THDL672 takes precedence.

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