Released
Datasheet
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATM Traffic Management Device
4.3.9 UTOPIA ATM Layer Interface Signals
4.3.9.1 Transmit UTOPIA ATM Layer Interface Signals
Table 16. Transmit UTOPIA ATM Layer Interface Signals (29 Pins)
Drive/Input Slew
Signal Name
Ball
Type
Description
Level
Rate
ATM_CLK
V27
In
CMOS
UTOPIA ATM Layer Clock provides
timing information for both the transmit
and receive UTOPIA interfaces.
TATM_ADD(4:0)
AH19, AG17, AF18,
AJ17, AG18
Out
Out
12 ma
12 ma
Mod Transmit UTOPIA ATM Layer Address
Bits 4 to 0.
TATM_DATA(15:0)
AH17, AH16, AF16,
AG16, AE16, AH15,
AE15, AF15, AG15, AJ13,
AH13, AH14, AG13,
AG14, AF13, AH12
Mod Transmit UTOPIA ATM Layer Data
Bits 15 to 0 are part of the 16-bit UTO-
PIA transmit data bus that carries data
toward the PHY layer device.
TATM_CLAV(3:0)
AH11, AF14, AG12, AF12
In
5 V or
LV TTL
Transmit UTOPIA ATM Layer Cell
Available Bits 3 to 0 are active high sig-
nals that indicate the selected PHY
layer devices may accept another cell.
TATM_SOC
AE12
AE14
AE13
Out
Out
Out
12 ma
12 ma
12 ma
Mod Transmit UTOPIA ATM Layer Start-
Of-Cell marks the start of a cell.
/TATM_WRITE_EN
TATM_PARITY
Mod Transmit UTOPIA ATM Layer Write
Enable enables the write of a cell byte.
Mod Transmit UTOPIA ATM Layer Odd
Parity bit over TATM_DATA(15:0).
4.3.9.2 Receive UTOPIA ATM Layer Interface Signals
Table 17. Receive UTOPIA ATM Layer Interface Signals (27 Pins)
Drive/
Input Level
Slew
Rate
Signal Name
Ball
Type
Description
RATM_ADD(4:0)
C19, C21, B21, E20,
D19
Out
12 ma
Mod Receive UTOPIA ATM Layer Address
Bits 4 to 0
RATM_DATA(15:0) D15, A17, B17, C17,
B18, D17, C16, B20,
In
5V or LV
TTL
Receive UTOPIA ATM Layer Data Bits
15 to 0 are part of the 16-bit UTOPIA
receive data bus that carries data from
the PHY layer device.
B19, D16, D18, C18,
E18, E16, E17, B22
RATM_SOC
D21
In
In
5V or LV
TTL
Receive UTOPIA ATM Layer Start-Of-
Cell marks the start of a cell.
RATM_CLAV(3:0)
C22, E19, A24, D20
5V or LV
TTL
Receive UTOPIA ATM Layer Cell
Available Bits 0 to 3 indicate the
selected PHY layer devices have
another cell.
/RATM_READ_EN
C20
Out
12 ma
Mod Receive UTOPIA ATM Layer Read
Enable causes a read from the FIFO in
the PHY layer device.
72
PMC [ PMC-SIERRA, INC ]
