Chapter 6: SDRAM Memory Controller
TX7901 User’s Manual (Rev. 6.30T – Nov, 2001)
6-17
6.5.5 ECC Error Address Register (read only) (0x1E00_0070)
127
32
0
96
31
4 3 0
ErrAddr
0
28
4
When there is an ECC Error, the failing address is stored in this register. This register
keeps the error address of the latest ECC error.
Field
Bits
Description
ErrAddr
31:4
Error Address [31:4]
–
3:0
Reserved
6.5.6 Refresh Register (0x1E00_0090) R/W
127
32
0
96
31
18 17 16 15 14 13 0
0
R
F
E
N
S
R
F
0
RIC
14
1
1
2
14
This register contains parameters that are used for all SDRAMs with the SDRAM controller.
Field
Bit(s)
Description
RIC
13:0
Refresh Interval Count Value (0x0400)
Implements standard CAS before refreshing RAS. Refresh
rates for all banks can be programmed in this register.
RefIntCnt is a 14-bit counter. If the default value is 0x400 for
example and if the clock is 100 MHz, then a refresh
sequence will occur every 10
µ
s.
(10 ns
×
1024) = 10.24
µ
s
–
15:14
Reserved (0)
NSRF
16
Non-Staggered Refresh (0)
In the non-staggered refresh mode, this bit is set and
sdrCSB[3:0] will be active to simultaneously refresh all
banks. Staggered refresh is used to refresh banks in order
sequentially.
RFE
17
Refresh Enable (0)
SDRAM refresh will be enabled when this bit is set, and will
be disabled when this bit is reset. This bit defaults to 0
(reset) after chip reset. This bit should be enabled after
BIOS finishes the SDRAM initialization and initializes all
other control registers in the SDRAM controller.
–
31:18
Reserved (0)
Summary of Contents for TMPR7901
Page 1: ...TX System RISC TX79 Family TMPR7901 Symmetric 2 way superscalar 64 bit CPU ...
Page 14: ...Handling Precautions ...
Page 15: ......
Page 17: ...1 Using Toshiba Semiconductors Safely 1 2 ...
Page 41: ...4 Precautions and Usage Considerations 4 2 ...
Page 42: ...TX7901 User s Manual Rev 6 30T November 2001 DOCUMENT NUMBER M 99 00004 07 ...
Page 43: ......
Page 259: ...Chapter 13 Removed TX7901 User s Manual Rev 6 30T Nov 2001 13 1 13 Removed ...
Page 260: ...Chapter 13 Removed TX7901 User s Manual Rev 6 30T Nov 2001 13 2 ...