PMC-Sierra, Inc.
PM5356
S/UNI-622-MAX
DATASHEET
S/UNI-622-MAX
PMC-1980589
ISSUE 5
SATURN USER NETWORK INTERFACE (622-MAX)
Pin Name
Type
Pin
No.
Function
RDAT[0]
RDAT[1]
RDAT[2]
RDAT[3]
RDAT[4]
RDAT[5]
RDAT[6]
RDAT[7]
RDAT[8]
RDAT[9]
RDAT[10]
RDAT[11]
RDAT[12]
RDAT[13]
RDAT[14]
RDAT[15]
Output
W21
W22
W23
V21
V22
U20
U21
U22
U23
T20
T21
T22
R21
R22
R23
P20
UTOPIA receive cell data (RDAT[15:0]) bus carries the ATM cell
octets that are read from the receive FIFO.
In 16-bit Level 2 ATM mode, RDAT[15:0] is consider valid only
when RENB is asserted. RDAT[15:0] is tri-stated when RENB is
sampled high.
In 8-bit Level 3 ATM mode, only the RDAT[7:0] signals are valid
when RVAL is asserted. RDAT[15:8] contain invalid data.
RDAT[15:0] is updated on the rising edge of RFCLK.
RVAL
Output
N21
The UTOPIA Level 3 receive data valid (RVAL) signal indicates
the validity of the receive data signals. When RVAL is high, the
receive signals RDAT, RSOC and RPRTY are valid. When
RVAL is low, all receive signals are invalid and must be
disregarded.
In 16-bit Level 2 ATM mode, RVAL is invalid and must be
ignored.
In 8-bit Level 3 ATM mode, RVAL will be high when valid data is
on the RDAT bus. The RVAL will transition low when the FIFO is
empty. Once deasserted, RVAL will remain deasserted until a
complete ATM cell is written into the receive FIFO.
RVAL is updated on the rising edge of RFCLK.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
27
PMC [ PMC-SIERRA, INC ]
