PM5352 PMC-Sierra, Inc., PM5352 Datasheet - Page 32

• Manufacturer Part Number: PM5352
• Description: SATURN USER NETWORK INTERFACE 155 (STAR)
• Manufacturer: PMC-Sierra, Inc.

DATA SHEET
PMC-1990421
Pin Name
RENB
RADR[2]
RADR[1]
RADR[0]
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
(POS)
(ATM)
Input
Input
Type
ISSUE 2
Pin
No.
P22
R23
P20
R22
Function
POS-PHY Receive multi-PHY Read Enable
(RENB).
The S/UNI-STAR supports both byte-level and
packet-level transfer. Packet-level transfer operates
as described above, with a selection phase when
RENB is deasserted and a transfer phase when
RENB is asserted. While RENB is asserted,
RADR[2:0] is used for polling RPA. Byte level
transfer works on a cycle basis. When RENB is
asserted data is transferred from the selected PHY
and RADR[2:0] is used to select the PHY. Nothing
happens when RENB is deasserted. Polling is not
possible; packet availability is directly indicated by
DRPA.
During a data transfer, RVAL shall be monitored
since it will indicate if the data is valid. Once RVAL
is deasserted, RENB or RADR[2:0] must be used to
select a new PHY for data transfer.
RENB must operate in conjunction with RFCLK to
access the FIFO’s at a high enough rate to prevent
FIFO overflows. The system may de-assert RENB
at anytime it is unable to accept another byte.
RENB is sampled on the rising edge of RFCLK.
Receive Address (RADR[2:0]). The RADR[2:0] bus
is used for device selection and device polling in
accordance with the Utopia Level 2 standard.
When RADR[2:0] is set to the same value as the
PHY_ADR[2:0] inputs than the receive interface of
this S/UNI-STAR is either being selected or polled.
Note that the null phy address 7H is an invalid
address and cannot be used to select the S/UNI-
STAR.
RADR[2:0] is sampled on the rising edge of TFCLK.
SATURN USER NETWORK INTERFACE 155 (STAR)
PM5352 S/UNI STAR
28