PM7375-SC datasheet(35/430 Pages) PMC

35 / 430 page

PM7375 LASAR-155

DATA SHEET

PMC-931127

ISSUE 6

LOCAL ATM SAR & PHYSICAL LAYER

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

RDAT[0]

RDAT[1]

RDAT[2]

RDAT[3]

RDAT[4]

RDAT[5]

RDAT[6]

RDAT[7]

I/O

106

105

104

103

102

101

100

The receive cell data (RDAT[7:0]) bus' function is

configured using input RXPHYBP.

When RXPHYBP is set high, the RDAT[7:0] signals

become inputs and are expected to carry the ATM cell

octets that are read from an external FIFO associated

with an external physical layer device. For this mode

of operation, RDAT[7:0] is sampled using the rising

edge of SYSCLK.

When RXPHYBP is set low, the RDAT[7:0] signals

become outputs and carry ATM cell octets marked for

this output port. For this mode of operation,

RDAT[7:0] is updated on the rising edge of SYSCLK.

RFIFOEB

RFIFOFB

Input

When RXPHYBP is set high, the active low receive

FIFO empty (RFIFOEB) signal indicates when a byte is

available to be read from an external FIFO. When

sampled high, RFIFOEB indicates that at least one

byte can be read. When sampled low, RFIFOEB

indicates that there are no bytes to be read. In this

mode of operation, RFIFOEB is sampled using the

rising edge of SYSCLK.

When RXPHYBP is set low, the active low receive

FIFO full (RFIFOFB) signal indicates when a byte can

be written to an external FIFO. When sampled high,

RFIFOFB indicates that at least one byte can be

written. When sampled low, RFIFOFB indicates that

the external FIFO is full and can accept no more

writes. In this mode of operation, RFIFOFB is

sampled using the rising edge of SYSCLK.

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