參數(shù)資料
型號: L64007
廠商: LSI CORP
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP160
封裝: PLASTIC, QFP-160
文件頁數(shù): 25/166頁
文件大小: 1015K
代理商: L64007
register
38 Wed May 28 17:37:25 1997
Draft 1/21/97
4-38
Registers
PRE.4 for Rev. D
Copyright 1997 by LSI Logic Corporation. All rights reserved.
REFR
DRAM Refresh Rate Mode
[7:4]
This 4-bit eld determines the refresh rate of the DRAM
device attached to L64007’s DRAM interface port. The
refresh rate is generated in multiples of 64 clock cycles.
After reset, these bits are 0000.
RAS_CNT
RAS Active Period
[3:0]
This 4-bit eld determines the tRAS duration in MCLK’s
256-cycle increments. The formula for calculating this
rate is: 256(RAS_CNT + 1) x 0.037 =
s.
4.8.9
System Status
Register (SSR)
The SSR is a 16-bit read-only register that provides real-time status infor-
mation on the various L64007 internal units. The SSR reports to the host
processor which interrupt source has activated the interrupt line. It also
reports on other operational conditions of the L64007 device.
Bit Settings
Refresh Rate (Cycles)
0000
64
0001
128 (2 * 64)
0010
192 (3 * 64)
..
.
1101
14 * 64
1110
15 * 64
1111
16 * 64
Bit Settings
Cycle Increment
Refresh Rate (
s)
0000
0
9.5 (minimum duration)
0001
1
19
..
1111
15
151.5 (maximum duration)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
OCU-
VEMP
OCU
VAF
OCU
AEMP
OCU
AAF
MMU
EMP
MMU
AF
RES SCINT
PSQ
VAL
CC
INT
PP
INT
MMU
INT
PCR
INT
CHD
INT
PSQCNT
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