User guide

SDRAM Controller

CS4953x4/CS4970x4 System Designer’s Guide

5.1.3 Configuring SDRAM Parameters

Not all SDRAM manufacturers conform to the same timing specifications. Therefore, the CS4953x4/

CS4970x4 DSP must be configured to match the timing specifications for the SDRAM being used. All

SDRAM parameters are set in DSP Condenser at design time. See Chapter 8, "DSP Condenser".for more

details.

Refer to the External Memory Interface section in the CS4953x4/CS4970x4 datasheet for timing

parameters that are summarized inTable 5-2.

SD_A10 SDRAM Address 10 74 103 Output

SD_A11 SDRAM Address 11 56 85 Output

SD_A12 SDRAM Address 12 55 84 Output

SD_BA0

SDRAM Bank Address 0/Flash Address 13 75 104 Input

SD_BA1

SDRAM Bank Address 1/Flash Address 14 77 106 Input

SD_D0 SDRAM Bidirectional Data Bit 0 39 68 BiDir

SD_D1 SDRAM Bidirectional Data Bit 1 37 65 BiDir

SD_D2 SDRAM Bidirectional Data Bit 2 35 64 BiDir

SD_D3 SDRAM Bidirectional Data Bit 3 34 63 BiDir

SD_D4 SDRAM Bidirectional Data Bit 4 32 61 BiDir

SD_D5 SDRAM Bidirectional Data Bit 5 31 60 BiDir

SD_D6 SDRAM Bidirectional Data Bit 6 30 59 BiDir

SD_D7 SDRAM Bidirectional Data Bit 7 29 58 BiDir

SD_D8 SDRAM Bidirectional Data Bit 8 49 78 BiDir

SD_D9 SDRAM Bidirectional Data Bit 9 48 77 BiDir

SD_D10 SDRAM Bidirectional Data Bit 10 46 75 BiDir

SD_D11 SDRAM Bidirectional Data Bit 11 45 74 BiDir

SD_D12 SDRAM Bidirectional Data Bit 12 43 72 BiDir

SD_D13 SDRAM Bidirectional Data Bit 13 42 71 BiDir

SD_D14 SDRAM Bidirectional Data Bit 14 41 70 BiDir

SD_D15 SDRAM Bidirectional Data Bit 15 40 69 BiDir

1. For 16-Mbit parts SD_BA0 is used as a bank select. For 64-Mbit and 128-Mbit parts SD_BA[1:0] is the 2-bit

bank select.

Table 5-1. SDRAM Interface Signals (Continued)

Signal Name Signal Description

LQFP-144

Pin #

LQFP-128

Pin #

Pin Type