Acer AL2021 AL2021 Service Guide - Page 45

+3.3V_DIG R40 10K/6 R43 10K/6 R67 10K/6 4 /OCM_WE 4 /OCM_RE 4 /ROM_CS /OCM_WE /OCM_RE /OCM_CS +3.3V_DIG GND 4 OCMADDR[0..19] 4 OCMDATA[0..7] OCMDATA[0..7] OCMADDR[0..19] C60 22uF/25V C59 0.1uF/6 Socket for a X8 Flash (64/128/256/512K) and PROMJETmemory Emulator OCMADDR18 OCMADDR17 OCMADDR16 OCMADDR15 OCMADDR14 OCMADDR13 OCMADDR12 OCMADDR11 OCMADDR10 OCMADDR9 OCMADDR8 OCMADDR7 OCMADDR6 OCMADDR5 OCMADDR4 OCMADDR3 OCMADDR2 OCMADDR1 OCMADDR0 XU1 1 30 A18 2 A17 3 29 28 4 A16 A15 A14 A13 25 23 26 27 5 6 7 8 9 A12 A11 A10 A9 A8 A7 A6 A5 A4 10 11 12 A3 A2 A1 A0 DQ7 21 20 OCMDATA7 OCMDATA6 DQ6 19 OCMDATA5 DQ5 DQ4 DQ3 DQ2 18 17 15 14 OCMDATA4 OCMDATA3 OCMDATA2 OCMDATA1 DQ1 DQ0 13 OCMDATA0 CE# OE# WE# 22 24 31 32 VCC VSS 16 /ROM_CS /OCM_RE /OCM_WE +3.3V_DIG A28F001 29LV040B GND +3.3V_DIG R68 R69 R70 R62 R55 R47 R50 OCMADDR8 OCMADDR9 OCMADDR13 OCMADDR14 OCMADDR15 OCMADDR16 OCMADDR18 OCMADDR17 OCMADDR19 OCMADDR10 OCMADDR11 OCMADDR12 10K/6 10K/6 10K/6 10K/6 10K/6 10K/6 10K/6 INT_OSC 8-BIT_FLASH2 R65 10K/6 R80 10K/6 R41 10K/6 R46 10K/6 R71 10K/6 Firmware_Bypass R56 DDC2BI R51 Serial_Interface_Debug1 R61 Serial_Interface_Debug2 R64 Serial_Interface_Debug3 R73 10K/6 10K/6 10K/6 10K/6 10K/6 8-BIT_FLASH1 8-BIT_FLASH3 TCLK OUTPUTS_ZERO OUTPUTS_ZERO GND GND 10: LOW (Use TCLK) 11: LOW (set all display output to '0') 12: LOW 13: LOW(disable serial interface debug) 14: LOW 15: LOW 16: HIGH (use crystal) 17: LOW (8bit bus with OCM access external ROM) 18: HIGH 19: LOW PROJECT : L0T Quanta Computer Inc. Title Size Date: 06. Memory I/F Document Number 06. Memory I/F Friday, July 11, 2003 L0T Rev 1A Sheet 6 of 8 - 45 -