Product specifications
VT8237R Data Sheet
Revision 2.06 December 15, 2004 -20- Pin Descriptions
General Purpose Outputs Pin Descriptions
General Purpose Outputs
Signal Name Pin # I/O Signal Description
GPO0 (VSUS33)
AA3 O
General Purpose Output 0.
GPO1 (VSUS33)
AE3 O
General Purpose Output 1.
GPO2 / SUSA# (VSUS33) AA2 O General Purpose Output 2. Rx94[2] = 1
GPO3 / SUSST1# (VSUS33) Y3 O General Purpose Output 3. Rx94[4] = 1
GPO4 / SUSCLK (VSUS33) AB3 O General Purpose Output 4. Rx95[1] = 1
GPO5 / CPUSTP# AC7 O General Purpose Output 5. RxE4[0] = 1
GPO6 / PCISTP# AD6 O General Purpose Output 6. RxE4[1] = 1
GPO7 / GNT5# R2 O General Purpose Output 7. RxE4[2] = 0
GPO8 / GPI8 / VGATE AC9 O General Purpose Output 8. RxE4[3] = 1, E5[4]=0
GPO9 / UDPWREN D25 O General Purpose Output 9. RxE4[5] = 1
GPO10 / GPI10 / APICD0 R25 O General Purpose Output 10. Rx58[6]=0 or APIC Rx3[0]=1
GPO11 / GPI11 / APICD1 T23 O General Purpose Output 11. Rx58[6]=0 or APIC Rx3[0]=1
GPO12 / GPI12 / INTE# D4 O General Purpose Output 12. RxE4[4]=1, 5B[1]=0
GPO13 / GPI13 / INTF# E4 O General Purpose Output 13. RxE4[4]=1, 5B[1]=0
GPO14 / GPI14 / INTG# A3 O General Purpose Output 14. RxE4[4]=1, 5B[1]=0
GPO15 / GPI15 / INTH# B3 O General Purpose Output 15. RxE4[4]=1, 5B[1]=0
GPO20 / GPI20 / ACSDIN2 / PCS0# U1 OD General Purpose Output 20. RxE4[6]=1, E5[1]=0
GPO21 / GPI21 / ACSDIN3 / PCS1# /SLPBTN# V3 OD General Purpose Output 21. RxE4[6]=1, E5[2]=0
GPO22 / GPI22 / GHI# R22 OD General Purpose Output 22. RxE5[3]=1, PMIO 4C[22]=1
GPO23 / GPI23 / DPSLP# P21 OD General Purpose Output 23. RxE5[3]=1, PMIO 4C[23]=1
GPO24 / GPI24 (GPIOA) / PCREQA / strap AE5 OD General Purpose Output 24. RxE6[0] = 1, 53[7] = 0
GPO25 / GPI25 (GPIOB) / PCREQB / strap AD5 OD General Purpose Output 25. RxE6[1] = 1, 58[7] = 0
GPO26 / GPI26 / SMBDT2 (VSUS33†) AD1 OD General Purpose Output 26. Rx95[2] = 1, 95[3] = 1
GPO27 / GPI27 / SMBCK2 (VSUS33†) AC3 OD General Purpose Output 27. Rx95[2] = 1, 95[3] = 1
GPO28 / GPI28 / VIDSEL / SATALED# AC8 OD General Purpose Output 28. RxE5[0] = 0, E5[3] = 1,
PMIO 4C[28]=1
GPO29 / GPI29 / VRDSLP AB9 OD General Purpose Output 29. RxE5[3] = 1, PMIO 4C[29]=1
GPO30 / GPI30 (GPIOC) / PCGNTA / strap AF5 OD General Purpose Output 30. RxE6[6] = 1, 53[7] = 0
GPO31 / GPI31 (GPIOD) / PCGNTB / strap AC6 OD General Purpose Output 31. RxE6[7] = 1, 58[7] = 0
Note: Register bits referenced above are Device 17 Function 0 unless indicated otherwise.
Note: The output state for each of the above general purpose outputs is selectable via Power Management I/O registers Rx4C-48
Note: Default pin functions are underlined in the table above.
† The suspend voltage is only used for maintaining the operation of the SMB function on these pins (Device 17 Function 0
Rx95[3] = 0). If VCC power is lost, the GPIO function of these pins and the state of PMIO Rx4C[27:26} (which determines the
GPO output level) will be lost also.
General Purpose I/O
Signal Name Pin # I/O Signal Description
GPIOA / GPI24 / GPO24 AE5 IO General Purpose I/O A / 24. RxE6[0] = 1
GPIOB / GPI25 / GPO25 AD5 IO General Purpose I/O B / 25. RxE6[1] = 1
GPIOC / GPI30 / GPO30 AF5 IO General Purpose I/O C / 30. RxE6[6] = 1
GPIOD / GPI31 / GPO31 AC6 IO General Purpose I/O D / 31. RxE6[7] = 1
The output type of the above pins may be selected as either OD or TTL (see Device 17 Function 0 RxE7)