Adlink cExpress-BT2 Manual do Utilizador descarregar pdf (Página 24)

Page 24 cExpress-BT2

Signal Pin # Description I/O PU/PD Comment

Pulled high internally on the module.

GPI[1] A63 General purpose input pins.

Pulled high internally on the module.

I 3.3V PU 10K 3.3V

GPI[2] A67 General purpose input pins.

Pulled high internally on the module.

I 3.3V PU 10K 3.3V

GPI[3] A85 General purpose input pins.

Pulled high internally on the module.

I 3.3V PU 10K 3.3V

3.3.16. Serial Interface Signals

Signal Pin # Description I/O PU/PD Comment

SER0_TX A98 General purpose serial port transmitter (TTL level output) O CMOS Power rail tolerance 5V / 12V

SER0_RX A99 General purpose serial port receiver (TTL level input) I CMOS Power rail tolerance 5V / 12V

SER1_TX A101 General purpose serial port transmitter (TTL level output) O CMOS Power rail tolerance 5V / 12V

SER1_RX A102 General purpose serial port receiver (TTL level input) I CMOS Power rail tolerance 5V / 12V

3.3.17. Power And System Management

Signal Pin # Description I/O PU/PD Comment

PWRBTN# B12 Power button to bring system out of S5 (soft off), active on falling edge. I 3.3VSB PU 10k

3.3VSB

SYS_RESET# B49 Reset button input. Active low request for module to reset and reboot. May

be falling edge sensitive. For situations when SYS_RESET# is not able to

reestablish control of the system, PWR_OK or a power cycle may be used.

I 3.3VSB PU 10k

3.3VSB

CB_RESET# B50 Reset output from module to Carrier Board. Active low. Issued by module

chipset and may result from a low SYS_RESET# input, a low PWR_OK

input, a VCC_12V power input that falls below the minimum specification, a

watchdog timeout, or may be initiated by the module software.

O 3.3VSB

PWR_OK B24 Power OK from main power supply. A high value indicates that the power is

good. This signal can be used to hold off Module startup to allow carrier

based FPGAs or other configurable devices time to be programmed.

I 3.3V PU 100k

3.3VSB

SUS_STAT# B18 Indicates imminent suspend operation; used to notify LPC devices. O 3.3VSB

SUS_S3# A15 Indicates system is in Suspend to RAM state. Active-low output. An inverted

copy of SUS_S3# on the carrier board (also known as “PS_ON”) may be

used to enable the non-standby power on a typical ATX power supply.

O 3.3VSB

SUS_S4# A18 Indicates system is in Suspend to Disk state. Active low output. O 3.3VSB

SUS_S5# A24 Indicates system is in Soft Off state. O 3.3VSB

Not supported,

connect to

SUS_S4#

WAKE0# B66 PCI Express wake up signal. I 3.3VSB PU 10k

3.3VSB

Not supported,

connected to

WAKE1#

WAKE1# B67 General purpose wake up signal. May be used to implement wake-up on

PS/2 keyboard or mouse activity.

I 3.3VSB PU 10k

3.3VSB

BATLOW# A27 Battery low input. This signal may be driven low by external circuitry to

signal that the system battery is low, or may be used to signal some other

external power-management event.

I 3.3VSB PU 10k

3.3VSB

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