TMPR3916 datasheet(56/225 Pages) TOSHIBA

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Chapter 2 Memory Controller (MC)

Preliminary

2-7

2.5

SDRAMC Functions

2.5.1

Address Translation

The table below shows the different memory organizations that have been considered during the

controller design and that can be used for each of the two memory channels.

Channel Size

(for one channel)

Mapped G-Bus

Address Bits

Toshiba Device

Number

Organizations

(Devices

× Banks × Rows × Columns × Bits)

8 Mbyte

[22:2]

TC59S6432

× 4 × 2 K × 256 × 32 (SDRAM, 64 Mbit)

16 Mbyte

[23:2]

TC59S6416

× 4 × 4 K × 256 × 16 (SDRAM, 64 Mbit)

32 Mbyte

[24:2]

TC59S6408

TC59SM716

× 4 × 4 K × 512 × 8 (SDRAM, 64 Mbit)

× 4 × 4 K × 512 × 16 (SDRAM, 128 Mbit)

64 Mbyte

[25:2]

TC59S6404

TC59SM708

TC59SM816

× 4 × 4 K × 1 K × 4 (SDRAM, 64 Mbit)

× 4 × 4 K × 1 K × 8 (SDRAM, 128 Mbit)

× 4 × 8 K × 512 × 16 (SDRAM, 256 Mbit)

128 Mbyte

[26:2]

TC59SM704

TC59SM808

× 4 × 4 K × 2 K × 4 (SDRAM, 128 Mbit)

× 4 × 8 K × 1 K × 8 (SDRAM, 256 Mbit)

× 4 × 8 K × 1 K × 16 (SDRAM, 512 Mbit)

256 Mbyte

[27:2]

TC59SM804

× 4 × 8 K × 2 K × 4 (SDRAM, 256 Mbit)

× 4 × 8 K × 2 K × 8 (SDRAM, 512 Mbit)

Therefore, SDRAMC supports the following memory organizations:

Banks:

2 or 4

Rows:

2 K, 4 K, 8 K

Columns:

256, 512, 1 K, 2 K

The following table shows address translation of the G-Bus address for supported memory

configurations.

Organization

Column Size

Organization

Row Size

Organization

Bank Size

Address Mapping

ColAddr

Address Mapping

RowAddr

Address Mapping

BankAddr

2 K

GAO[9:2]

GAO[20:10]

GAO[21]

GAO[22:21]

4 K

GAO[9:2]

GAO[21:10]

GAO[22]

GAO[23:22]

256

8 K

GAO[9:2]

GAO[22:10]

GAO[23]

GAO[24:23]

2 K

GAO[10:2]

GAO[21:11]

GAO[22]

GAO[23:22]

4 K

GAO[10:2]

GAO[22:11]

GAO[23]

GAO[24:23]

512

8 K

GAO[10:2]

GAO[23:11]

GAO[24]

GAO[25:24]

2 K

GAO[11:2]

GAO[22:12]

GAO[23]

GAO[24:23]

4 K

GAO[11:2]

GAO[23:12]

GAO[24]

GAO[25:24]

1024

8 K

GAO[11:2]

GAO[24:12]

GAO[25]

GAO[26:25]

2 K

GAO[12:2]

GAO[23:13]

GAO[24]

GAO[25:24]

4 K

GAO[12:2]

GAO[24:13]

GAO[25]

GAO[26:25]

2048

8 K

GAO[12:2]

GAO[25:13]

GAO[26]

GAO[27:26]

Note: GAO (G-Bus Address Output) refers to the physical address of the internal system bus.

TMPR3916 Datasheet(PDF) 56 Page - Toshiba Semiconductor

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