PM5352 datasheet(36/77 Pages) PMC

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PM5352 S/UNI STAR

DATA SHEET

PMC-1990421

ISSUE 2

SATURN USER NETWORK INTERFACE 155 (STAR)

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

Pin Name

Type

No.

Function

DRCA

Output

(ATM)

M21

UTOPIA Direct Receive Cell Available (DRCA).

These output signals provides direct status

indication of when a cell is available in the receive

FIFO for the corresponding port. DRCA can be

configured to be de-asserted when either zero or

four bytes remain in the selected/addressed FIFO.

DRCA will thus transition low on the rising edge of

RFCLK after Payload word 24 (RCALEVEL0=1) or

19 (RCALEVEL0=0) is output if the PHY being

polled is the same as the PHY in use.

DRCA[x] is updated on the rising edge of RFCLK.

DRPA

Output

(POS)

M21

POS-PHY Direct Receive Packet Available

DRPA provides a direct status indication. DRPA

indicates when data is available in the receive

FIFO. When DRPA is high, the receive FIFO has at

least one end of packet or a programmable

minimum number of bytes to be read. DRPA is

otherwise low. The polarity of DRPA can be inverted

with the RPAINV register bit.

DRPA is updated on the rising edge of RFCLK.

RMOD

Output

(POS)

Y19

POS-PHY Receive Modulo (RMOD).

The RMOD signal indicates the number of bytes

carried by the RDAT[15:0] bus during the last word

of a packet transfer. During a packet transfer every

word must be complete except the last word which

can be composed of 1 or 2 bytes. RMOD set high

indicate a single byte word (present on MSB’s,

LSB’s are discarded) while RMOD set low indicates

a two byte word. RMOD is only used in POS mode.

RMOD is tristated when RENB is deasserted.

RMOD is also tristated when either the null-PHY

address (0x7H) or an address not matching the

address space set by PHY_ADR[2:0] is latched

from the RADR[2:0] inputs when RENB is high.

RMOD is updated on the rising edge of RFCLK.

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