User Manual

TriFlash Interface Description

3-17

Table 3-13. Maximum Data Transfer Rate Definition

TRAN_SPEED Bit Code

2:0 transfer rate unit:

0=100kbit/s, 1=1Mbit/s, 2=10Mbit/s, 3=100Mbit/s, 4...

7=Reserved

6:3 time value:

0=Reserved, 1=1.0, 2=1.2, 3=1.3, 4=1.5, 5=2.0, 6=2.5, 7=3.0,

8=3.5, 9=4.0, A=4.5, B=5.0, C=5.5, D=6.0, E=7.0, F=8.0

7 Reserved

CCC—The TriFlash command set is divided into subsets (command classes). The card command class register

CCC defines which command classes are supported by this device. A value of ‘1’ in a CCC bit means that the

corresponding command class is supported. Refer to Table 3-14 for command class definitions.

Table 3-14. Supported Card Command Classes

CCC Bit Supported Card Command Class

0 class 0

1 class 1

......

11 class 11

READ_BL_LEN—The maximum read data block length is computed as 2

READ_BL_LEN

. The maximum block length

might therefore be in the range 512...2048 bytes. Note that in the TriFlash, the WRITE_BL_LEN is always equal to

READ_BL_LEN.

Table 3-15. Data Block Length

READ_BL_LEN Block Length

0-8 Reserved

9 2

= 512 Bytes

......

11 2

= 2048 Bytes

12-15 Reserved

READ_BL_PARTIAL— READ_BL_PARTIAL is always set to 1 in the TriFlash. Partial Block Read is always

allowed in the TriFlash. It means that smaller blocks can be used as well. The minimum block size is one byte.

READ_BL_PARTIAL=0 means that only the READ_BL_LEN block size can be used for block oriented data

transfers.

READ_BL_PARTIAL=1 means that smaller blocks can be used as well. The minimum block size will be equal to

minimum addressable unit (one byte).

WRITE_BLK_MISALIGN—Defines if the data block to be written by one command can be spread over more

than one physical block of the memory device. The size of the memory block is defined in WRITE_BL_LEN.

WRITE_BLK_MISALIGN=0 signals that crossing physical block boundaries is invalid.

WRITE_BLK_MISALIGN=1 signals that crossing physical block boundaries is allowed.