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70V639S10BFGI Datasheet(PDF) 6 Page - Integrated Device Technology |
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70V639S10BFGI Datasheet(HTML) 6 Page - Integrated Device Technology |
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6 / 24 page  IDT70V639S High-Speed 3.3V 128K 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 Byte 1 I/O9-17 Byte 0 I/O0-8 MODE X H H X X X X High-Z High-Z Deselected–Power Down X H X L X X X High-Z High-Z Deselected–Power Down X H L H H H X High-Z High-Z Both Bytes Deselected XH L H H L L High-Z DIN Write to Byte 0 Only X H LH LH L DIN High-Z Write to Byte 1 Only XH L H L L L DIN DIN Write to Both Bytes LH LH H L H High-Z DOUT Read Byte 0 Only LH LH LH H DOUT High-Z Read Byte 1 Only LH LH L L H DOUT DOUT Read Both Bytes H H L H L L X High-Z High-Z Outputs Disabled 5621 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. 3. Each byte is controlled by the respective UB or 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 H H LLL L DATAOUT DATAOUT Read Data in Semaphore Flag(3) H ↑ XX L L X DATAIN Write I/O0 into Semaphore Flag LX X X X L ______ ______ Not Allowed 5621 tbl 03 |
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