NAND08GAH0A Datasheet, PDF (54/116 Pages) Numonyx B.V – 1 Gbyte, 2 Gbyte, 1.8 V/3 V supply, NAND Flash memories with MultiMediaCard™ interface

Device registers
8
Device registers
NAND08GAH0A, NAND16GAH0D
There are five different registers within the device interface:
● Operation conditions register (OCR)
● Card identification register (CID)
● Card specific data register (CSD)
● Relative card address register (RCA)
● DSR (driver stage register)
● Extended card specific data register (EXT_CSD)
These registers are used for the serial data communication. The device does not implement
the DSR register.
The MultiMediaCard has a status register to provide information about the device current
state and completion codes for the last host command.
8.1
Operation conditions register (OCR)
The 32-bit operation conditions register stores the V_CCQ, the input/output voltage of the
Flash memory component. The device is capable of communicating (identification
procedure and data transfer) with any MultiMediaCard host using any operating voltage
within 1.65 V and 1.95 V (low-voltage range) or 2.7 V and 3.6 V (high-voltage range)
depending on the voltage range supported by the host. The 31 least significant bits are
constant. Bit 32 is the busy flag as defined in the MultiMediaCard specification document.
If the host tries to change the OCR values during an initialization procedure the changes in
the OCR content will be ignored.
The level coding of the OCR register is as follows:
● Restricted voltage windows = Low
● Device busy = Low
Table 32. OCR register definition
OCR bit
Description
MultiMediaCard
6 to 0
7
14 to 8
23 to 15
30 to 24
31
Reserved
000 0000b
Low V_CCQ
1b
2.0 - 2.6
000 0000b
2.7 - 3.6 (High V_CCQ range)⁽¹⁾
1 1111 1111b
Reserved
000 0000b
Power-up status bit (busy) ⁽²⁾
1. The voltage for internal Flash memories (V_CCi) should be in the 2.7 V to 3.6 V range.
2. This bit is set to Low if the device has not finished the power-up routine.
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