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參數(shù)資料
| 型號： | 5962D1022901QXC |
| 元件分類： | DRAM |
| 英文描述： | 64M X 40 SYNCHRONOUS DRAM, 5.4 ns, CQFP128 |
| 封裝： | CERAMIC, QFP-128 |
| 文件頁數(shù)： | 8/68頁 |
| 文件大?。?/td> | 1475K |
| 代理商： | 5962D1022901QXC |
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16
Operating Mode
The normal operating mode is selected by setting M7 and M8 to zero; the other combinations of values for M7 and M8 are reserved
for future use and/or test modes. The programmed burst length applies to both READ and WRITE bursts. Test modes and reserved
states should not be used because unknown operation or incompatibility with future versions may result.
WRITE Burst Mode
When M9 = 0, BL programmed via M0–M2 applies to both READ and WRITE bursts; when M9 = 1, the programmed burst length
applies to READ burst, but write accesses are single-location (nonburst) accesses.
COMMANDS
Table 5 provides a quick reference of available commands. This is followed by a written description of each command. Three
additional Truth Tables appear in the Operations section; these tables provide current state/next state information.
Notes:
1. CKE is HIGH for all commands shown.
2. A0–A11 define the op-code written to the mode register, and A12 should be driven LOW.
3. A0–A12 provide row address, and BA0, BA1 determine which bank is made active.
4. A0–A9, A11 provide column address; A10 HIGH enables the auto precharge feature (nonpersistent), while A10 LOW disables the auto precharge feature; BA0, BA1
determine which bank is being read from or written to.
5. A10 LOW: BA0, BA1 determine the bank being precharged. A10 HIGH: All banks precharged and BA0, BA1 are “Don’t Care.”
6. This command is AUTO REFRESH if CKE is HIGH.
7. Internal refresh counter controls row addressing; all inputs and I/Os are “Don’t Care” except for CKE.
8. Activates or deactivates the DQs during WRITEs (zero-clock delay) and READs (two-clock delay).
COMMAND INHIBIT
The COMMAND INHIBIT function prevents new commands from being executed by the SDRAM, regardless of whether the CLK
signal is enabled. The SDRAM is effectively deselected. Operations already in progress are not affected.
NO OPERATION (NOP)
The NO OPERATION (NOP) command is used to perform a NOP to an SDRAM that is selected (CS# is LOW). This prevents
unwanted commands from being registered during idle or wait states. Operations already in progress are not affected.
Table 5: Truth Table 1 Commands and DQM Operation
Name (Function)
CS#
RAS# CAS# WE# DQM Address
DQs
Notes
COMMAND INHIBIT (NOP)
H
X
NO OPERATION (NOP)
L
H
X
ACTIVE (Select bank and activate row)
L
H
X
Bank/
row
X
3
READ (Select bank and column, and start READ burst)
L
H
L
H
L/H8
Bank/
col
X
4
WRITE (Select bank and column, and start WRITE burst)
L
H
L
L/H8
Bank/
col
Valid
4
BURST TERMINATE
L
H
L
X
Active
PRECHARGE (Deactivate row in bank or banks)
L
H
L
X
Code
X
5
AUTO REFRESH
L
H
X
6, 7
LOAD MODE REGISTER
L
X
Op-code
X
4
Write enable/output enable
--
L
--
Active
8
Write inhibit/output High-Z
--
H
--
High-Z
8
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