PMC-Sierra, Inc.
PRELIMINARY
PM5381 S/UNI-2488
DATASHEET
PMC-2000489
ISSUE 1
SATURN USER NETWORK INTERFACE FOR 2488 MBIT/S
Function
Pin Name
Type
Pin
No.
U30
The POS-PHY receive data valid (RVAL) signal indicates the
validity of the receive data signals. When RVAL is high, the
receive signals RDAT[31:0], RPRTY, RSOP, REOP, RMOD[1:0],
and RERR are valid. When RVAL is low, all receive signals are
invalid and must be disregarded.
RVAL
Output
RVAL will be high when valid data is on the RDAT[31:0] bus.
RVAL will transition low when the FIFO is empty. RVAL will
remain low until a programmable minimum number of bytes
exist in the receive FIFO. The threshold is configurable.
RVAL is updated on the rising edge of RFCLK.
The POS-PHY receive error (RERR) signal indicates that the
current packet is invalid due to an error such as invalid FCS,
excessive length or received abort. RERR may only assert
when REOP is asserted marking the last word of the packet.
RERR
REOP
RERR is only used in POS mode and is updated on the rising
edge of RFCLK.
P30
The POS-PHY receive end of packet (REOP) signal marks the
end of packet on the RDAT[31:0] bus. It is legal for RSOP to be
high at the same time REOP is high. REOP is set high to mark
the last word of the packet presented on the RDAT[31:0] bus.
When REOP is high, RMOD[1:0] specifies if the last word has 1,
2, 3, or 4 valid bytes of data.
Output
REOP is only used for POS operation and is updated on the
rising edge of RFCLK.
Proprietary and Confidentail to PMC-Sierra Inc., and for its Customer’s Internal Use
31
PMC [ PMC-SIERRA, INC ]
