PM5347 datasheet(265/302 Pages) PMC

265 / 302 page

PM5347 S/UNI-PLUS

DATA SHEET

PMC-941033

ISSUE 6

SATURN USER NETWORK INTERFACE PLUS

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

249

The GFC Insertion Port Diagram (Figure 31) illustrates the relationship between

the transmit cell pulse, TCP output and the transmit generic flow control, TGFC

input. The MSB (GFC[3]) of the four bit GFC code on the TGFC input is identified

using the TCP output. The S/UNI-PLUS accumulates the code and transmits the

code in the next transmit cell. If the next transmit cell is an idle/unassigned cell,

the GFC code provided in the Idle/Unassigned Cell Header Pattern register is

overwritten. If the next transmit cell is read from the FIFO, the GFC code passed

through the FIFO is overwritten.

13.3

Drop Side Receive Interface

Figure 32

- Receive Synchronous FIFO, TSEN=0

RDAT[15:0]

••••

W(n)

W(n-2)

RCA

••••

RXPRTY[1:0]

••••

W(n-3)

W(n-4)

W(n-5)

W(n-1)

RFCLK

••••

RRDENB

••••

RSOC

••••

RCALEVEL=0

Read Ignored

The Receive Synchronous FIFO Timing, TSEN=0 Diagram (Figure 32) illustrates

the operation of the drop side receive interface with tristating disabled. The

S/UNI-PLUS indicates a cell is available by asserting the receive cell available

output, RCA. RCA remains high until the receive FIFO is near empty (four words

remaining), empty or if an error condition is detected. Selection of empty and

near empty is made using the RCALEVEL0 bit in the RACP Interrupt

Enable/Control register. For the near empty option, RCA transitions low four

words before the last word of the last cell is read from the FIFO. RCA remains

low for a minimum of one RFCLK clock cycle and then can transition high to

indicate that there are additional cells available in the FIFO.

PM5347 Datasheet(PDF) 265 Page - PMC-Sierra, Inc

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