HB28K032MM3 datasheet(13/91 Pages) RENESAS

13 / 91 page

HB28K032/L064/J128/J256/J512MM3, HB28K032/L064/J128/J256RM3

Rev.0.02, Sep.15.2004, page 13 of 89

• SPEC_VERS

Defines the Spec version supported by the card. It includes the commands set definition and the definition

of the card responses. The card identification procedure is compatible for all spec versions!

SPEC Version

SPEC_VERS

System specification version number

“0011”

System specification version 3.3

The Spec version of these Renesas MultiMediaCards is related to the “MultiMediaCard system

specification, Version 3.3”. The parameter SPEC_VERS has permanently the value “0011”.

• TAAC

Defines the asynchronous data access time:

TAAC Access Time Definition

TAAC bit

Description

Values

2:0

Time exponent

0 = 1 ns, 1 = 10 ns, 2 = 100 ns, 3 = 1

µs, 4 = 10 µs,

5 = 100

µs, 6 = 1 ms, 7 = 10 ms

6:3

Time mantissa

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

Reserved

Always ‘0’

The value for the asynchronous delay for these Renesas MultiMediaCards is 1 ms. The coded TAAC value

is 0x0E (= 1 ms). For more details refer to Chapter “Operating Characteristics”.

• NSAC

Defines the worst case for the synchronous data access time. The unit for NSAC is 100-clock cycles.

Therefore, maximum value for the data access time is 25.6k clock cycles. The total access time N

AC as

expressed in the Table “Timing Values” is the sum of both TAAC and NSAC. It has to be computed by

the host for the actual clock rate. The read access time should be interpreted as a typical delay for the first

data bit of a data block or stream. The value of NSAC for these Renesas MultiMediaCards is 0x01 (100-

clock cycles). For more details refer to Chapter “Operating Characteristics”.

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