MC68181 Datasheet, PDF (63/119 Pages) Freescale Semiconductor, Inc – Advance Information ROAMING FLEX chip SIGNAL PROCESSOR

Freescale Semiconductor, Inc.
MC68181
Packet Communication Initiated by the FLEX chip IC
SS
2
4
READY 1
SCK
3
MOSI
D31
D1 D0
D31
D1 D0
D31
D1 D0
MISO
D31
D1 D0
D31
D1 D0
D31
D1 D0
High Impedance State
AA1230
Figure B-2 Typical Multiple Packet Communications Initiated by the FLEX chip IC
When the host is reading a packet from the FLEX chip IC, it must send a valid packet
to the FLEX chip IC. If the host has no data to send, it is suggested that the host send
a Checksum Packet with all of the data bits set to 0 in order to avoid disabling the
FLEX chip IC. (See Checksum Packet on page B-6.)
Figure B-3 on page B-3 illustrates that it is not necessary to de-select the FLEX chip
IC between packets when the packets are initiated by the FLEX chip IC.
SS
READY
SCK
MOSI
D31
D1 D0
D31
D1 D0
D31
D1 D0
MISO
D31
D1 D0
D31
D1 D0
D31
D1 D0
High Impedance State
AA1231
Figure B-3 Multiple Packet Communications Initiated by the FLEX chip IC with No De-select
MOTOROLA
MC68181 Technical Data Sheet
B-3
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