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70T631S15BFG8 Datasheet(PDF) 6 Page - Integrated Device Technology |
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70T631S15BFG8 Datasheet(HTML) 6 Page - Integrated Device Technology |
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6 / 27 page  IDT70T633/1S High-Speed 2.5V 512/256K x 18 Asynchronous Dual-Port Static RAM Industrial and Commercial Temperature Ranges 6 NOTE: 1. "H" = VIH, "L" = VIL, "X" = Don't Care. Truth Table I—Read/Write and Enable Control(1) OE SEM CE0 CE1 UB LB R/W ZZ Upper Byte I/O9-17 Lower Byte I/O0-8 MODE X H H X X X X L High-Z High-Z Deselected–Power Down X H X L X X X L High-Z High-Z Deselected–Power Down X H L H H H X L High-Z High-Z Both Bytes Deselected XH LH H L L L High-Z DIN Write to Lower Byte XH LH L H L L DIN High-Z Write to Upper Byte X H L H LL LL DIN DIN Write to Both Bytes LH LH H L H L High-Z DOUT Read Lower Byte LH LH L H H L DOUT High-Z Read Upper Byte LH LH L L H L DOUT DOUT Read Both Bytes H H L H L L X L High-Z High-Z Outputs Disabled X X X X X X X H High-Z High-Z High-Z Sleep Mode 5670 tbl 02 Truth Table II – Semaphore Read/Write Control(1) NOTES: 1. There are eight semaphore flags written to I/O0 and read from all the I/Os (I/O0-I/O17). These eight semaphore flags are addressed by A0-A2. 2. CE = L occurs when CE0 = VIL and CE1 = VIH. CE = H when CE0 = VIH and/or CE1 = VIL. 3. Each byte is controlled by the respective UB and LB. To read data UB and/or LB = VIL. Inputs(1) Outputs Mode CE(2) R/W OE UB LB SEM I/O1-17 I/O0 HH L L L L DATAOUT DATAOUT Read Data in Semaphore Flag(3) H ↑ XX L L X DATAIN Write I/O0 into Semaphore Flag L XXXX L ______ ______ Not Allowed 5670 tbl 03 |
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