Packet Formats - NEC UPD98413 User Manual

RERR
Receive error.
RERR is used to indicate that there is an error in the current packet. The µPD98413 asserts
(output):
RERR when REOP is asserted. RERR is considered valid only when RVAL is asserted.
RVAL Receive data valid.
(output): RVAL indicates the validity of the receive signals. When RVAL is high, RDAT, RMOD, RSOP,
REOP and RERR signals are valid. RSX is invalid when RVAL is high. When RVAL is low,
RDAT, RMOD, RSOP, REOP and RERR signals are invalid. RSX is valid when RVAL is low.
RSX Receive start of transfer.
(output): RSX indicates when the in-band port address is presented on the RDAT bus. When RSX is
high and RVAL is low, RDAT[7:0] is the in-band port address selected port.
The in-band port address specified the port can be set any value by the IADRR register. By
default, the µPD98413 outputs the following addresses for the corresponding ports.
0: port0, 1: port1, 2: port2, 3: port3

4.3.2 Packet Formats

The format of the packet transferred via the POS interface in the following figure.
132
CHAPTER 4 INTERFACES
Figure 4-14. Packet Format
Example: 62-byte packet
D31
B1 B5 B9
B2 B6 B10
B3
B7 B11
B4
B8 B12
D0
16 words
PRELIMINARY
B61
B62
x
x
NEC confidential and Proprietary