PPC34C60 datasheet(54/58 Pages) SMSC

54 / 58 page

SMSC DS – PPC34C60

Page 54

Rev. 06/01/2001

ADVANCED INFORMATION

FIGURE 24 - DRAM WRITE CYCLE TIMING

When the DRAM bus width (4, 8 or 16 bits) is narrower than the Host bus (always 8-bits) or the Peripheral bus (8 or 16 bits)

than the PPC34C60 will implement fast page mode DRAM cycles to complete the data transfer. These page mode

transfers are performed for DMA as well as Host DRAM access.

See DRAM Write Cycle Timing parameters.

DRAM WRITE CYCLE TIMING

PARAMETER

MIN

TYP

MAX

UNITS

10-bit DRAM row address valid to nWR

asserted.

[1 BCLK

-10]

[1 BCLK]

[1BCLK

+10]

10-bit DRAM row address valid to nRAS

asserted.

[1 BCLK

-10]

[1 BCLK]

[1BCLK

+10]

nRAS asserted to valid 10-bit DRAM

column address.

[1 BCLK

-10]

[1 BCLK]

[1BCLK

+10]

10-bit DRAM column address valid to

nCAS asserted.

[1 BCLK

-10]

[1 BCLK]

[1BCLK

+10]

10-bit DRAM column address incremented

following nCAS asserted.

[1 BCLK

-10]

[1 BCLK]

[1BCLK

+10]

Valid write data in relation to the 10-bit

column

address

presented

the

PPC34C60.

DRAM column address incremented to

nCAS deasserted.

[1 BCLK

-10]

[1 BCLK]

[1BCLK

+10]

Valid write data in relation to the 10-bit

column

address

presented

the

PPC34C60.

nCAS deasserted to valid data placed on

the data bus.

t10

nCAS and nRAS both deasserted to nWR

deasserted.

[1 SCLK]

t10

Data Valid

Row Addr

Col Addr

Col Addr +2

Col Addr +1

SAB

Data Valid

Col Addr bits 8 & 9

SAB

MA[8:9]

SA[0:7]

nCAS

nRAS

nRD

nWR

SD[0:15]

BUSCLK

PPC34C60 数据表(PDF) 54 Page - SMSC Corporation

PPC34C60 数据表(HTML) 54 Page - SMSC Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

数据表下载

链接网址

PPC34C60 数据表(PDF) 54 Page - SMSC Corporation

PPC34C60 数据表(HTML) 54 Page - SMSC Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

数据表 下载

链接网址

数据表下载