Texas Instruments SM320C6455-EP Peripheral Configuration Register 1 Description, DDR2CTL Emifactl

Models: SM320C6455-EP

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SM320C6455-EP

FIXED-POINT DIGITAL SIGNAL PROCESSOR

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SPRS462B – SEPTEMBER 2007 – REVISED JANUARY 2008

3.4.3Peripheral Configuration Register 1 Description

The Peripheral Configuration Register (PERCFG1) is used to enable the EMIFA and DDR2 Memory Controller. EMIFA and the DDR2 Memory Controller do not have corresponding status bits in the Peripheral Status Registers. The EMIFA and DDR2 Memory Controller peripherals can be used within 16 SYSCLK3 cycles after EMIFACTL and DDR2CTL are set to 1. Once EMIFACTL and DDR2CTL are set to 1, they cannot be set to 0. Note that if the DDR2 Memory Controller and EMIFA are disabled at reset through the device configuration pins (DDR2.EN[ABA0] and EMIFA[ABA1]), they cannot be enabled through the PERCFG1 register.

31

 

 

 

 

8

 

 

 

Reserved

 

 

 

 

 

R-0x00

 

 

 

7

 

2

1

0

 

 

 

Reserved

DDR2CTL

EMIFACTL

 

 

 

R-0x00

R/W-0

R/W-0

LEGEND: R/W = Read/Write; R = Read only; -n= value after reset

 

 

 

 

Figure 3-5. Peripheral Configuration Register 1 (PERCFG1) - 0x02AC 002C

 

 

Table 3-8. Peripheral Configuration Register 1 (PERCFG1) Field Descriptions

 

Bit

Field

Value

Description

 

 

31:2

Reserved

 

Reserved.

 

 

1

DDR2CTL

 

Mode Control for DDR2 Memory Controller. Once this bit is set to 1, it cannot be changed to 0.

 

 

0

Set DDR2 to disabled

 

 

 

 

1

Set DDR2 to enabled

 

 

0

EMIFACTL

 

Mode control for EMIFA. Once this bit is set to 1, it cannot be changed to 0. This bit defaults to 1 if

 

 

 

EMIFA 8 bit ROM boot is used (BOOTMODE[3:0] = 0100b).

 

 

 

 

0

Set EMIFA to disabled

 

 

 

 

1

Set EMIFA to enabled

 

 

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Texas Instruments SM320C6455-EP manual Peripheral Configuration Register 1 Description, DDR2CTL Emifactl