PM5351 datasheet(49/393 Pages) PMC

49 / 393 page

S/UNI-TETRA

PMC-Sierra, Inc.

PM5351 S/UNI-TETRA

DATASHEET

PMC-1971240

ISSUE 7

SATURN USER NETWORK INTERFACE (155-TETRA)

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

Pin Name

Type

No.

Function

TADR[4]

TADR[3]

TADR[2]

TADR[1]

TADR[0]

Input

(POS)

G21

H20

G22

H21

G23

POS-PHY Transmit Write Address (TADR[4:0])

signals.

The TADR[4:0] bus is used to select the FIFO (and

hence port) that is written to using the TENB signal.

In packet level transfer mode, TADR[4:0] is also

used for polling on PTPA.

Note that address 0x1F is the null-PHY address and

cannot be assigned to any port on the

S/UNI-TETRA.

TADR[4:0] is sampled on the rising edge of TFCLK.

TCA

Output

(ATM)

J23

UTOPIA Transmit multi-PHY Cell Available (TCA)

The TCA signal indicates when a cell is available in

the transmit FIFO for the port polled by TADR[4:0]

when TENB is asserted. When high, TCA indicates

that the corresponding transmit FIFO is not full and

a complete cell may be written. When TCA goes

low, it can be configured to indicate either that the

corresponding transmit FIFO is near full or that the

corresponding transmit FIFO is full. TCA will

transition low on the rising edge of TFCLK after the

Payload word 19 (TCALEVEL0=0) or 23

(TCALEVEL0=1) is sampled if the PHY being polled

is the same as the PHY in use. To reduce FIFO

latency, the FIFO depth at which TCA indicates "full"

can be set to one, two, three or four cells. Note that

regardless of what fill level TCA is set to indicate

"full" at, the transmit cell processor can store 4

complete cells.

TCA is tri-stated when either the null-PHY address

(0x1F) or an address not matching the address

space set by PHY_ADR[2:0] is latched from the

TADR[4:0] inputs when TENB is high.

TCA is updated on the rising edge of TFCLK.

PM5351 Datasheet(PDF) 49 Page - PMC-Sierra, Inc

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