Sharp XL-HP737 Service Manual - Page 54

XL-HP737 IC4 VHiL8316V35-1 D-RAM (L8316V35) (Serial No.40100012 ~ 40103011) IC4 VHiLV1625635T D-RAM (LV1625635T) (Serial No.40203012 ~) Terminal Name A0-A8 I/O0-15 WE OE RAS Function Address Inputs Data Inputs/Outputs Write Enable Output Enable Row Address Strobe Terminal Name UCAS LCAS VCC GND NC Function Upper Column Address Strobe Lower Column Address Strobe Power Ground No Connection IC4 VHiL8316V35-1 D-RAM (L8316V35) (Serial No.40100012 ~ 40103011) IC4 VHiLV1625635T D-RAM (LV1625635T) (Serial No.40203012 ~) VCC 1 I/O0 2 I/O1 3 I/O2 4 I/O3 5 VCC 6 I/O4 7 I/O5 8 I/O6 9 I/O7 10 40 GND 39 I/O15 38 I/O14 37 I/O13 36 I/O12 35 GND 34 I/O11 33 I/O10 32 I/O9 31 I/O8 NC 11 NC 12 WE 13 RAS 14 NC 15 A0 16 A1 17 A2 18 A3 19 VCC 20 30 NC 29 LCAS 28 UCAS 27 OE 26 A8 25 A7 24 A6 23 A5 22 A4 21 GND OE WE LCAS UCAS CAS CLOCK GENERATOR WE CAS CONTROL LOGICS WE OE CONTROL LOGIC DATA I/O BUFFERS OE RAS RAS CLOCK GENERATOR REFRESH COUNTER RAS DATA I/O BUS COLUMN DECODERS SENSE AMPLIFIERS ROW DECODER A0-A8 ADDRESS BUFFERS MEMORY ARRAY 262,144 x 16 Figure 4 BLOCK DIAGRAM OF IC I/O0-I/O15 8 - 9