at91sam9g20-cu ATMEL Corporation, at91sam9g20-cu Datasheet - Page 6

• Manufacturer Part Number: at91sam9g20-cu
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

Table 3-1.
6
Signal Name
NRST
TST
BMS
DRXD
DTXD
IRQ0 - IRQ2
FIQ
PA0 - PA31
PB0 - PB31
PC0 - PC31
D0 - D31
A0 - A25
NWAIT
NCS0 - NCS7
NWR0 - NWR3
NRD
NWE
NBS0 - NBS3
CFCE1 - CFCE2
CFOE
CFWE
CFIOR
CFIOW
CFRNW
CFCS0 - CFCS1
AT91SAM9G20 Preliminary
Signal Description List (Continued)
Function
Microcontroller Reset
Test Mode Select
Boot Mode Select
Debug Receive Data
Debug Transmit Data
External Interrupt Inputs
Fast Interrupt Input
Parallel IO Controller A
Parallel IO Controller B
Parallel IO Controller C
Data Bus
Address Bus
External Wait Signal
Chip Select Lines
Write Signal
Read Signal
Write Enable
Byte Mask Signal
CompactFlash Chip Enable
CompactFlash Output Enable
CompactFlash Write Enable
CompactFlash IO Read
CompactFlash IO Write
CompactFlash Read Not Write
CompactFlash Chip Select Lines
Advanced Interrupt Controller - AIC
PIO Controller - PIOA - PIOB - PIOC
Static Memory Controller - SMC
External Bus Interface - EBI
CompactFlash Support
Debug Unit - DBGU
Reset/Test
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Output
Type
Input
Input
Input
Input
Input
Input
I/O
I/O
I/O
I/O
I/O
Active
Level
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
Comments
Pull-up resistor
Pull-down resistor. Accepts
between 0V and VDDBU.
No pull-up resistor
BMS = 0 when tied to GND.
BMS = 1 when tied to VDDIOP.
Pulled-up input at reset
Pulled-up input at reset
Pulled-up input at reset
Pulled-up input at reset
0 at reset
6384B–ATARM–15-Dec-08