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B.6 Use of Rabbit 3000 Parallel Ports
Table B-5 lists the Rabbit 3000 parallel ports and their use for the Prototyping Board.
Table B-5. Prototyping Board Use of Rabbit 3000 Parallel Ports
Port
PA0–PA3
PA4
PA5–PA7
PB0
PB1
PB2–PB5
PB6–PB7
PC0
I/O
Data Bus
Data Bus
Data Bus
Input
Input
Address Bus
Address Bus
Output
Use
LCD/keypad module, motor driver, LEDs
LCD/keypad module, motor driver,
relay and relay LED
LCD/keypad module, motor control
CLKB
CLKA Programming Port
LCD/keypad module
—
TXD SPI, serial flash
Initial State
Active high
Active high
Active high
High
High
(when not driven by CLKA)
High
High
High (SPI disabled)
Serial Port D
PC1
PC2
Input
Output
RXD SPI, serial flash
TXC RS-485
High (SPI disabled)
High (RS-485 disabled)
Serial Port C
PC3
PC4 *
Input
Output
RXC RS-485
TXB
High (RS-485 disabled)
High (disabled)
Serial Port B
PC5 *
PC6
Input
Output
RXB
TXA Programming Port
High (disabled)
High
Serial Port A
PC7
PD0
PD1
PD2
PD3
PD4–PD6
PD7
PE0–PE1
PE2
PE3
PE4–PE5
PE6
Input
Output
Output
Output
Output
Input
Output
Input
Output
Output
Input
Output
RXA Programming Port
RCM33600/RCM33610 USR LED off
(shared with NAND flash busy)
Soldered-in NAND flash chip enable
SPI, serial flash
SPI, serial flash
Serial flash
RS-485 Tx enable
IN0–IN1
Ethernet AEN,
NAND flash function enable
Motor driver A clock pulse
IN2–IN3, J8
LCD/keypad module
High
High
High (disabled)
Low (SPI disabled)
High (SPI CS disabled)
High (disabled)
Low (RS-485 Tx disabled)
High
High (disabled)
Low (disabled)
High
High (disabled)
94
RabbitCore RCM3360/RCM3370
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