S
S
S
D
D
D
H
H
H
C
C
C
1
1
1
0
0
0
C
C
C
a
a
a
r
r
r
d
d
d
s
s
s
e
e
e
r
r
r
i
i
i
e
e
e
s
s
s
Rev. 1.0
4~32GB High Capacity Secure Digital Card
Transcend Information Inc.
16
•
TAAC
This field is fixed to 0Eh, which indicates 1 ms. The host should not use TAAC, NSAC, and R2W_FACTOR to calculate
timeout and should uses fixed timeout values for read and write operations.
TAAC bit position
code
2:0
time unit
0=1ns, 1=10ns, 2=100ns, 3=1µs, 4=10µs,
5=100µs, 6=1ms, 7=10ms
6:3
time value
0=reserved, 1=1.0, 2=1.2, 3=1.3,
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
•
NSAC
This field is fixed to 00h. NSAC should not be used to calculate time-out values.
•
TRAN_SPEED
The following table defines the maximum data transfer rate per one data line - TRAN_SPEED:
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
Maximum Data Transfer Rate Definition