參數(shù)資料
型號: MX53L06402L-50
廠商: MACRONIX INTERNATIONAL CO LTD
元件分類: PROM
英文描述: FLASH 2.7V PROM CARD, XMA7
封裝: CRAD-7
文件頁數(shù): 47/55頁
文件大?。?/td> 262K
代理商: MX53L06402L-50
51
P/N: PM1043
REV. 1.0, NOV. 25, 2003
MX53L06402
The access time (t
AT ) is divided into two parts:
T
SAD : The synchronous access time. This time defines the time of the maximum number of cycles which are required
to access a byte of the memory field.
T
AAD : The asynchronous access time to read a byte out of the memory field The synchronous part of the access
time is seven cycles. At 20 MHz one cycle is 50 ns (1/f CLK ), multiplied with NSAD the resulting frame time is T SAD
= 5 us. The asynchronous access delay of the MX53L06402 is T AAD =0. The resulting memory access time t AT
is equal to the sum of both parts:
tAT = tAAD + TSAD
with
TSAD =
NSAD
fCLK
tAT
tSAD
tAAD
CMD
DAT
command frame
response frame
data
Figure 27: Access Time
Table 36: Access Time
Parameter
Symbol
Max
Unit
Remark
Synchronous access delay cycles
N
SAD
100
cycles
Synchronous access delay
T
SAD
5
us
@20MHZ clock frequency
Asynchronous access delay
T
AAD
0us
Memory access time
t
AT
5
us
@20 MHZ clock frequency
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 NSAD (maximum: 100 cycles) by division with 100 and rounding
up to the next integer:
NSAC=0x01(100 cycles)
TAAC=0x0E(1ms)
For more details on NSAC and TAAC CSD-entries see "Chapter 5.3: Card specific data (CSD)".
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