Rainbow Electronics AT91CAP9S250A User Manual
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6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
ICE and JTAG
NTRST
Test Reset Signal
Input
Low
No pull-up resistor
TCK
Test Clock
Input
No pull-up resistor
TDI
Test Data In
Input
No pull-up resistor
TDO
Test Data Out
Output
TMS
Test Mode Select
Input
No pull-up resistor
JTAGSEL
JTAG Selection
Input
Pull-down resistor
RTCK
Return Test Clock
Output
Reset/Test
NRST
Microcontroller Reset
I/O
Low
Pull-up resistor
TST
Test Mode Select
Input
Pull-down resistor
BMS
Boot Mode Select
Input
Pull-up resistor
Debug Unit - DBGU
DRXD
Debug Receive Data
Input
DTXD
Debug Transmit Data
Output
Advanced Interrupt Controller - AIC
IRQ0 - IRQ1
External Interrupt Inputs
Input
FIQ
Fast Interrupt Input
Input
PIO Controller - PIOA - PIOB - PIOC - PIOD
PA0 - PA31
Parallel IO Controller A
I/O
Pulled-up input at reset
PB0 - PB31
Parallel IO Controller B
I/O
Pulled-up input at reset
PC0 - PC31
Parallel IO Controller C
I/O
Pulled-up input at reset
PD0 - PD31
Parallel IO Controller D
I/O
Pulled-up input at reset
Direct Memory Access Controller - DMA
DMARQ0-DMARQ3
DMA Requests
Input
External Bus Interface - EBI
D0 - D31
Data Bus
I/O
Pulled-up input at reset
A0 - A25
Address Bus
Output
0 at reset
NWAIT
External Wait Signal
Input
Low
Static Memory Controller - SMC
NCS0 - NCS5
Chip Select Lines
Output
Low
NWR0 - NWR3
Write Signal
Output
Low
NRD
Read Signal
Output
Low
NWE
Write Enable
Output
Low
NBS0 - NBS3
Byte Mask Signal
Output
Low
Table 3-1.
Signal Description List (Continued)
Signal Name
Function
Type
Active
Level
Comments