MFC2000 datasheet(90/426 Pages) ETC

90 / 426 page

MFC2000 Multifunctional Peripheral Controller 2000

Hardware Description

4-60

Conexant

100723A

DRAM

ASIC

Q-

Switch

Q-

Switch

DWRn

CASEn[0]

CASEn[1]

CASOn[0]

CASOn[1]

DWRn

RASn[0]

addr[11:0]

RASn[0]

addr[11:0]

addr[u:0]

data[7:0]

RASn[1]

CASOn[0]

DWRn

DOEOn (Wron)

data[15:0]

Bank 0

(Interleaved)

Bank 1

(8-bit

Non-interleaved)

WEn

OEn

WEn

DOEOn (WRon)

DOEen (WRen)

OEn

WEn

Figure 4-17. DRAM Interface Example

Figure 4-17 gives an example of how each bank of DRAMs might be setup for non-battery back-up DRAM

system. In this example, Bank 0 is setup for an 8-bit non-interleaved memory bank and Bank 1 is setup with a 16-

bit 2-way interleaved DRAM bank.

Note:

DWRn is a battery backed-up signal and is ‘high’ during the battery back-up mode. All inputs

of the prime powered logic will have ‘no power’ or ‘low’ during the battery back-up mode.

Therefore, all external logic, which uses DWRn, should be battery backed-up logic and

should be gated with WRPROTn to ensure that outputs are ‘low’ when the prime power is off

for the battery back-up DRAM operation.

DWRn, CASO[1:0]n and CASE[1:0]n are shared by both DRAM banks (RAS[0]n and

RAS[1]n). If you only want to back up one bank by battery power, all shared signals should

be separated by the external logic and should follow the rule in note 2.

MFC2000 数据表(PDF) 90 Page - List of Unclassifed Manufacturers

MFC2000 数据表(HTML) 90 Page - List of Unclassifed Manufacturers

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 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载

链接网址

MFC2000 数据表(PDF) 90 Page - List of Unclassifed Manufacturers

MFC2000 数据表(HTML) 90 Page - List of Unclassifed Manufacturers

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 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表 下载

链接网址

数据表下载