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7027L20PFGI Datasheet(PDF) 4 Page - Integrated Device Technology |
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7027L20PFGI Datasheet(HTML) 4 Page - Integrated Device Technology |
4 / 20 page 6.42 IDT7027S/L High-Speed 32K x 16 Dual-Port Static RAM Industrial and Commercial Temperature Ranges 4 NOTES: 1. Chip Enable references are shown above with the actual CE0 and CE1 levels, CE is a reference only. 2. Port "A" and "B" references are located where CE is used. 3. "H" = VIH and "L" = VIL. Truth Table I – Chip Enable Truth Table II – Non-Contention Read/Write Control NOTES: 1. A0L — A14L ≠ A0R — A14R. 2. Refer to Chip Enable Truth Table. Truth Table III – Semaphore Read/Write Control NOTES: 1. There are eight semaphore flags written to via I/O0 and read from all the I/Os (I/O0 __I/O15). These eight semaphore flags are addressed by A0-A2. 2. Refer to Chip Enable Truth Table. CE CE0 CE1 Mode L VIL VIH Port Selected (TTL Active) < 0.2V >VCC - 0.2V Port Selected (CMOS Active) H VIH X Port Deselected (TTL Inactive) XVIL Port Deselected (TTL Inactive) >VCC - 0.2V X Port Deselected (CMOS Inactive) X<0.2V Port Deselected (CMOS Inactive) 3199 tbl 02 Inputs(1) Outputs Mode CE(2) R/W OE UB LB SEM I/O8-15 I/O0-7 H X X X X H High-Z High-Z Deselected: Power-Down X X X H H H High-Z High-Z Both Bytes Deselected LL X L H H DATAIN High-Z Write to Upper Byte Only LL X H L H High-Z DATAIN Write to Lower Byte Only LL X L L H DATAIN DATAIN Write to Both Bytes LH L L H H DATAOUT High-Z Read Upper Byte Only LH LH LH High-Z DATAOUT Read Lower Byte Only LH L L LH DATAOUT DATAOUT Read Both Bytes X X H X X X High-Z High-Z Outputs Disabled 3199 tbl 03 Inputs(1) Outputs Mode CE(2) R/W OE UB LB SEM I/O8-15 I/O0-7 HH L X X L DATAOUT DATAOUT Read Data in Semaphore Flag XH L H H L DATAOUT DATAOUT Read Data in Semaphore Flag H ↑ XX X L DATAIN DATAIN Write I/O0 into Semaphore Flag X ↑ XH H L DATAIN DATAIN Write I/O0 into Semaphore Flag L X XL XL ______ ______ Not Allowed LX X X L L ______ ______ Not Allowed 3199 tbl 04 |
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