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MX28F2000TQC-90C4 Datasheet(PDF) 7 Page - Macronix International |
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MX28F2000TQC-90C4 Datasheet(HTML) 7 Page - Macronix International |
7 / 31 page 7 MX28F2000T P/N: PM0472 REV. 1.0, Jun 13, 1997 COMMAND DEFINITIONS When low voltage is applied to the VPP pin, the con- tents of the command register default to 00H, enabling read-only operation. Placing high voltage on the VPP pin enables read/write operations. Device operations are selected by writing specific data patterns into the command register. Ta- ble 1 defines these MX28F2000T register commands. Table 2 defines the bus operations of MX28F2000T. TABLE 2. MX28F2000T BUS OPERATIONS OPERATION VPP(1) A0 A9 CE OE WE DQ0-DQ7 READ-ONLY Read VPPL A0 A9 VIL VIL VIH Data Out Output Disable VPPL X X VIL VIH VIH Tri-State Standby VPPL X X VIH X X Tri-State Read Silicon ID (Mfr)(2) VPPL VIL VID(3) VIL VIL VIH Data = C2H Read Silicon ID (Device)(2) VPPL VIH VID(3) VIL VIL VIH Data = 3CH READ/WRITE Read VPPH A0 A9 VIL VIL VIH Data Out(4) Standby(5) VPPH X X VIH X X Tri-State Write VPPH A0 A9 VIL VIH VIL Data In(6) NOTES: 1. VPPL may be grounded, a no-connect with a resistor tied to ground, or < VCC + 2.0V. VPPH is the programming voltage specified for the device. When VPP = VPPL, memory contents can be read but not written or erased. 2. Manufacturer and device codes may also be accessed via a command register write sequence. Refer to Table 1. All other addresses don't care. 3. VID is the Silicon-ID-Read high voltage.(11.5V to 13v) 4. Read operations with VPP = VPPH may access array data or Silicon ID codes. 5. With VPP at high voltage, the standby current equals ICC + IPP (standby). 6. Refer to Table 1 for valid Data-In during a write operation. 7. X can be VIL or VIH. |
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