User`s guide

4-6 Intel
®
StrongARM
®
SA-1110 Microprocessor Development Board User’s Guide
Hardware Considerations
4.3.1 GPIO 0 and GPIO 1
When the SA-1111 Development Module and Angel debug monitor are attached, GPIO 0 and
GPIO 1 have special use at system boot time. The Angel boot software reads the SA-1110 GPIO 0
and GPIO 1 to determine which of four boot images to jump to. After system reset, GPIO 0 and
GPIO 1 are driven through the SA-1111 Development Module’s test CPLD from switch pack SW2,
switches 1 and 2. After boot time, the GP01_OFF bit in the NCR may be set to three-state the
CPLD GPIO 0 and GPIO 1 drivers and allow these GPIOs to be used as their normal functions.
When the SA-1110 Development Board is used without the SA-1111 Development Module, the
GPIO 0 and GPIO 1 signals are used for the soft power on/off switches and a spare fast interrupt
(FIQ) signal.
If the Angel boot software is run on the SA-1110 Development Board without the SA-1111
Development Module attached, then S1 and S2 on the SA-1110 Development Board, which drive
GPIO 0 and GPIO 1, can be used to select the Angel boot vector.
Table 4-3. UCB 1300 CODEC
GPIO
SA-1100 Development
Platform
a
SA-1100 Multimedia and SA-1101
Development Boards
b
SA-1110 Development Platform
9 ADC_SYNC ACD_SYNC ADC_SYNC
8 DAA_OH DAA_OH DAA_OH (LED)
7 DAA_RI# DAA_RI# DAA_RI-
6 RED_LED# 7 segment dot LED CLID (caller ID)
5 GRN_LED# NOT USED FuncSW6
4 SEVEN_SEG_BLANK NOT USED FuncSW5
3 SEVEN_SEG_LED[3] NOT USED FuncSW4
2 SEVEN_SEG_LED[2] NOT USED FuncSW3
1 SEVEN_SEG_LED[1] NOT USED FuncSW2
0 SEVEN_SEG_LED[0] NOT USED FuncSW1
a. Order number DE–1S110–OA
b. Order number DE–1S110–OC