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參數資料
型號: romr0008
廠商: SIEMENS AG
英文描述: MultiMediaCard R0008 8 Mbyte ROM(多媒體卡 R0002 8 Mbyte ROM)
中文描述: 多媒體R0008 8字節的光盤(多媒體卡R0002 8字節光盤)
文件頁數: 39/41頁
文件大?。?/td> 208K
代理商: ROMR0008
Siemens
Product Manual R0008
Semiconductor Group
40
3.1
In the CSD are two fields to code the asynchronous and the synchronous access delay time:
TAAC, asynchronous access delay
NSAC, maximum number of cycles for receiving and interpreting of a command frame
The value for the CSD field NSAC is calculated from
N
SAD
(maximum: 300 cycles) by division with
100 and rounding up to the next integer:
N
The value for the CSD field TAAC is rounded up to 0.6
μ
s
:
NSAC=0x03
For more details on NSAC and TAAC CSD-entries see "Chapter 5.3: Card specific data (CSD)".
TAAC=0x6A
Parameter
Symbol
Max
Unit
Remark
Synchronous access delay cycles
Synchronous access delay
Asynchronous access delay
Memory access time
N
SAD
T
SAD
T
AAD
t
AT
300
15
0.6
15.6
cycles
μ
s
μ
s
μ
s
@20 MHZ clock frequency
@20 MHZ clock frequency
Table 31: Access Time
CMD
Figure 21: Access time
t
AT
T
AAD
T
SAD
DAT
response frame
data
command frame
NSAC
-100
100
=
=
TAAC
T
AAD
6 100
ns
=
=
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