Maxim Integrated Secure Microcontroller - Manual (Page 105)

Secure Microcontroller User’s Guide
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Port 2.3 WR
Input that allows the host to write data or commands to DBBIN.
Port 2.4
OBF
Output flag that indicates to a host that the output buffer is full and should be read.
Port 2.5 IBF
Output that indicates to a host that the input buffer is empty.
Port 2.6
DRQ
Output that indicates to a host that a DMA is required.
Port 2.7 DACK
Input that indicates to the DS5001 that the host has granted a DMA.
Figure 12-6. Use of the RPC Mode
Table 12-A. Use of the RPC Mode
CE RD WR A0 REGISTER
0 0 1 0 Data Out
0 0 1 1 Status
0 1 0 0 Data In
0 1 0 1 Command In
1 X X X No Register
P2.0/A0
P2.1/
CE
P2.2/ RD
P2.3/ WR
P2.4/OBF
P2.5/
IBF
P2.6/DRQ
P2.7/
DACK
PORT 2 CONTROL BUS
P0.0/D0
P0.1/D1
P0.2/D2
P0.3/D3
P0.4/D4
P0.5/D5
P0.6/D6
P0.7/D7
PORT 0 DATA BUS