CHAPTER 4 INTERFACES
PRELIMINARY
NEC confidential and Proprietary
132
RERR
(output):
Receive error.
RERR is used to indicate that there is an error in the current packet. The
µ
PD98413 asserts
RERR when REOP is asserted. RERR is considered valid only when RVAL is asserted.
RVAL
(output):
Receive data valid.
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
(output):
Receive start of transfer.
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
µ
PD98413 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.
Figure 4-14. Packet Format
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B61
B62
x
x
16 words
D0
D31
Example: 62-byte packet
Содержание NEASCOT-P65
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