SST48CF016 datasheet(31/60 Pages) SST

31 / 60 page

Data Sheet

CompactFlash Card

SST48CF008 / 016 / 024 / 032 / 048 / 064 / 096 / 128 / 192 / 256

S71125-03-000

9/01

375

3.1.2 Contiguous I/O Mapped Addressing

When the system decodes a contiguous block of I/O registers to select the CompactFlash card, the registers are

accessed in the block of I/O space decoded by the system as follows:

Note: Address lines which are not indicated are ignored by the CompactFlash card for accessing all the registers in this table.

TABLE

3-3: CONTIGUOUS I/O DECODING

-REG

Offset

-IORD=0

-IOWR=0

Notes

0000

Even RD Data

Even WR Data

1. Register 0 is accessed with -CE1 low and -CE2 low (and A0 = Don’t Care) as a word register on the combined Odd Data Bus and

Even Data Bus (D15-D0). This register may also be accessed by a pair of byte accesses to the offset 0 with -CE1 low and -CE2 high.

Note that the address space of this word register overlaps the address space of the Error and Feature byte-wide registers that lie at

offset 1. When accessed twice as byte register with -CE1 low, the first byte to be accessed is the Even Byte of the word and the sec-

ond byte accessed is the Odd Byte of the equivalent word access. A byte access to register 0 with -CE1 high and -CE2 low accesses

the error (read) or feature (write) register.

0001

Error

Features

2. Registers at offset 8, 9, and D are non-overlapping duplicates of the registers at offset 0 and 1.

Register 8 is equivalent to register 0, while register 9 accesses the Odd Byte. Therefore, if the registers are byte accessed in the

order 9 then 8 the data will be transferred Odd Byte then Even Byte.

Repeated byte accesses to register 8 or 0 will access consecutive (Even then Odd) Bytes from the data buffer. Repeated word

accesses to register 8, 9, or 0 will access consecutive words from the data buffer. Repeated byte accesses to register 9 are not sup-

ported. However, repeated alternating byte accesses to registers 8 then 9 will access consecutive (Even then Odd) Bytes from the

data buffer. Byte accesses to register 9 access only the Odd Byte of the data.

0010

Sector Count

0011

Sector No.

0100

Cylinder Low

0101

Cylinder High

0110

Select Card/Head

0111

Status

Command

1000

Dup. Even RD Data

Dup. Even WR Data

1001

Dup. Odd RD Data

Dup. Odd WR Data

1101

Dup. Error

Dup. Features

1110

Alt Status

Device Ctl

1111

Drive Address

Reserved

T3-3.0 375

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