HB288064MM1 Datasheet, PDF (12/79 Pages) Hitachi Semiconductor – MultiMediaCard 64 MByte

HB288064MM1
• 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
‘0010’
System specification version number
System specification version 2.11
The Spec version of the HB288064MM1 is related to the “MultiMediaCard system specification, Version
2.11”. The parameter SPEC_VERS has permanently the value 2.
• TAAC
Defines the asynchronous data access time:
TAAC Access Time Definition
TAAC bit
2:0
6:3
7
Description
time exponent
time mantissa
reserved
Values
0 = 1 ns, 1 = 10 ns, 2 = 100 ns, 3 = 1 µs, 4 = 10 µs,
5 = 100 µs, 6 = 1 ms, 7 = 10 ms
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
always ‘0’
The value for the asynchronous delay for the HB288064MM1 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. N_AC is defined as 100*NSAC clock cycles,
where NSAC presents a binary value. Max. value for the data access time N_AC is 25.6k clock cycles. The
total access time is the sum of both TAAC and N_AC*clock period. The value of NSAC for the
HB288064MM1 is 0x01 (100 cycles). For more details refer to Chapter “Operating Characteristics”.
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