參數(shù)資料
型號: R8820LV
廠商: Electronic Theatre Controls, Inc.
英文描述: 16-BIT RISC MICROCONTROLLER
中文描述: 16位RISC微控制器
文件頁數(shù): 80/98頁
文件大小: 1000K
代理商: R8820LV
R DC
19. PSRAM Control Unit
The PSRAM interface is provided by the R8820LV and the refresh control unit automatically generates refresh bus cycles. The
RISC DSP Controller
R8820LV
RDC Semiconductor Co.
Rev:1.0
Subject to change without notice
80
refresh control unit uses the internal microprocessor clock as a operating source clock. if the power-saved mode is enabled, the
refresh control unit must be programmed to reflect the new clock rate. Software programs the registers (E0, E2, E4) to control
the refresh control unit operation.
Bit 15-9
: M6-M0, Refresh Base. M6-M0 map to A19-A13 of the 20-bit memory refresh address.
Bit 8-0
: Reserved.
Bit 15-9
: Reserved
Bit 8-0: RC8-RC0, Refresh Counter Reload Value.
Bit 15: E
, Enable RCU.
Set 1: Enable the refresh counter unit
Set 0 : Disable the refresh counter unit.
Bit 14-9
: Reserved
Bit 8-0: T8-T0
, Refresh Count. Read only bits and these bits present value of the down counter which triggers refresh
requests.
Memory Partition Register
Offset : E0h
Reset Value : 0000h
2
3
0
1
4
5
6
7
8
9
10
11
12
13
14
15
M6 - M0
0
0
0
0
0
0
0
0
0
Clock Prescaler Register
Offset : E2h
Reset Value :
2
3
0
1
4
5
6
7
8
9
10
11
12
13
14
15
0
0
0
0
0
0
0
RC8 - RC0
Enable RCU Register
Offset : E4h
Reset Value : 0000h
2
3
0
1
4
5
6
7
8
9
10
11
12
13
14
15
0
0
0
0
0
0
E
T8 - T0
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