| Svmbol | TVDe | Name and Funaion |
| AO -A25 | IN PUT | ADDRESS INPUTS: AO through A25 enable direct addressing of up t0 64MB ofmemory on the card. Signal AO is not used in word access mode. A25 is the most significant bit. (address pins used are based on card densitv.see Dinout for hi~hest used address Din) |
| DQO - DQ15 | IN PUT/OUT PUT | DATA INPU T/O UTPU T: DQO TH ROU GH DQ15 con stitute the bi-directional databus. DQO - DQ 7 constitute the lower (even) byte and DQ 8 - DQ15 the uDDer (odd) bvte. DQ 15 is the MSB. |
| C E1CE2# | IN PUT | CARD ENABLE l AND 2: CEl # enables even byte accesses, C E2 # enables odd byte accesses. Multiplexing AO, C El # and C E2 # allow s 8- bit hosts to access all data on DQO - DQ 7. |
| OE# | IN PUT | OUTPUT ENABLE: Active low signal enabling read data from the m emorV card. |
| WE# | IN PUT | WRITE ENABLE: Active low signal gating write data to the memory card. |
| RDY/BSY | OUTPUT | READY/BU SY OUTPUT: N ot used for SRAM cards |
| CD1CD2# | OUTPUT | CARD D ETECT l and 2: Provide card insertion detection. These signals are connected to ground internally on the memory card. The host socket interface circuitry shall supply 10K-ohm or larger pull-up resistors on these sianal Dins. |
| WP | OUTPUT | W RITE PRO TEC T: Follow s hardware Write Protect Switch. When Switch is placed in on position, signalis pulled high (10K ohm). When switch is off signal is Dulled low. |
| VPPl, VPP2 | NC | PRO G RAM/ERA S E POW ER SU PPLY: N ot used for SRAM card s. |
| VCC | | CARD POWER SUPPLY: 3.3V / 5.OV for allinternal circuitrv. |
| GND | | GROUND: for allinternal circuitrv. |
| REG | IN PUT | ATTRIBUTE M EMO RY SELEC T : only used with cards built with oDtional attribute memorV. |
| RST | IN PUT | RESET: N ot used for SRAM cards |
| WAIT | OUTPUT | WAIT: This signalis pulled high internally for compatibility. N o wait states are generated. |
| BVDl, BVD2 | OUTPUT | BATTERY VO LTAG E D ETEC T: Provides status of Battery voltage. BVD2 = BVDl = Voh (battery voltage is guaranteed to retain data) BVD2 = Vol, BVDl = Voh (data is valid, battery recharge required) BVD2 = BVDl = Vol (data may no longer be valid, battery requires extended rechargel |
| VSl, VS2 | OUTPUT | VO LTAGE S EN SE: N otifies the host socket of the card's VCC requirements. VSlis grounded and VS2 is open to indicate a 3.3V/5V 16 bit card. with a 5V kev. has been inserted. |
| RFU | | RESERVED FOR FUTURE USE |
| NC | | NO INTERNA L C O NNEC TIO N TO CARD: pin may be driven or left floatina |
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