ID242 Datasheet, PDF (8/33 Pages) Sharp Electrionic Components – Flash Memory Card

SHARP
ID242 SERIES PRODUCT OVERVIEW
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6. Functions
6.1 Common Memory
6. 1. 1 Common Memory Architecture
Figure 2 shows common memory architecture of ID242 series flash memory card. Device pair is consisted of two
pieces of flash memory devices. Each device has individually erasable and lockable blocks. All
blocks are divided into odd bytes and even bytes.
Each device pair and block is selected by address bits. Table 3 shows definitions of address bits.
(a) For 2, 4, 8, 1OMB
F100'2.0:
F10580'
(b) For 16MB, 20MB
Figure 2. Common Memory Architecture
Table 3. Address Difinitions
Address Pifinitions
2MB - IOMB 16MB ,20MB
Select Even / Odd byte in the byte access
mode.
A0
1Select address in the block.
Select a block.
I
A16-Al
I
1 A20-A17 1 A21-A17 1
1Select a device pair.
1 A25-A21 1 A25-A22 1
T1051-01
CPS0002-002OMay.1991 3