TMPR3916 datasheet(62/225 Pages) TOSHIBA

62 / 225 page

Chapter 2 Memory Controller (MC)

Preliminary

2-13

Address Mask Register (DCAM)

Bit

Name

AMX



Bit

Name

AMY



Bit

Name

Function

Reset

Value

R/W

31:22

AMX

Address Mask Memory Channel X

This field is used to mask the base address for memory bank X.

1 = Bit is taken into account during comparison

0 = Bit is don’t care for the comparison

The base address mask is used to select the memory part of an

appropriate size. It is also possible to mirror DRAM memory parts or

to protect memory parts using this register.

R/W

21:16



Wired to zero

15:6

AMY

Address Mask Memory Channels Y

The same as for memory channels X.

R/W

5:0



Wired to zero

Timing Register (DCTR)

Bit

313029

282726252423

222120191817

Name

RFC

WRL

Bit

987

654321

Name

APL

RASL

CASL

PAL

ARL

Bit

Name

Function

Reset

Value

R/W

31:18

RFC

Refresh Counter Reload Value

This field provides the reload value for the internal refresh counter.

The refresh counter is implemented as a 14 bit down counter, which

reloads and issues a refresh request, every time a value of 0 is

reached.

This Settings depends on the specified refresh cycle time and

number of rows of the connected memory devices:

Rows

Number

Frequency

Operation

Time

fresh

(Example settings at 60 MHz, counter values / settings in Hex)

Time

2 K Row

4 K Row

8 K Row

32 ms

0x03A9

0x01D4

0x00EA

64 ms

0x0752

0x03A9

0x01D4

128 ms

0x0EA4

0x0752

0x03A9

0x1000

R/W

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