PowerPC 405CR Embedded Controller Data Sheet
Signal Functional Description (Part 4 of 6)
Multiplexed signals are shown in brackets following the first signal name assigned to each multiplexed ball.
Notes:
1. Receiver input has hysteresis
2. Must pull up (recommended value is 3kΩ to 3.3V, 10kΩ to 5V)
3. Must pull down (recommended value is 1kΩ)
4. If not used, must pull up (recommended value is 3kΩ to 3.3V)
5. If not used, must pull down (recommended value is 1kΩ)
6. Strapping input during reset; pull-up or pull-down required
Signal Name
Description
I/O
Type
Notes
5V tolerant
3.3V LVTTL
UART1_Rx
UART1 Serial In data
I
1, 4
Rcvr
5V tolerant
3.3V LVTTL
UART1_Tx
UART1 Serial Out data.
O
I
6
UART1 Data Set Ready
or
5V tolerant
UART1_DSR
[UART1_CTS]
1, 4
3.3V LVTTL
Rcvr
UART1 Clear To Send. To access this function, software must
toggle a DCR register bit.
UART1 Request To Send
or
UART1_RTS
5V tolerant
3.3V LVTTL
O
6
[UART1_DTR]
UART1 Data Terminal Ready. To access this function, software
must toggle a DCR register bit.
5V tolerant
3.3V LVTTL
IICSCL
IIC Serial Clock
IIC Serial Data
I/O
I/O
1, 2
1, 2
5V tolerant
3.3V LVTTL
IICSDA
Interrupts Interface
Interrupt requests
or
5V tolerant
3.3V LVTTL
IRQ0:6[GPIO17:23]
I[I/O]
1, 5
General Purpose I/O. To access this function, software must
toggle a DCR register bit.]
JTAG Interface
5V tolerant
3.3V LVTTL
Rcvr
TDI
Test data in
I
1, 4
1, 4
5V tolerant
3.3V LVTTL
Rcvr
TMS
TDO
TCK
JTAG test mode select
Test data out
I
O
I
5V tolerant
3.3V LVTTL
5V tolerant
3.3V LVTTL
Rcvr
JTAG test clock
JTAG reset
1, 4
5
5V tolerant
Rcvr
TRST
I
27
IBM [ IBM ]
