Car Stereo System - Car Radio Digital Signal Processor User Manual

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3.4.3 Peripheral Configuration Register 1 Description
SM320C6455-EP
FIXED-POINT DIGITAL SIGNAL PROCESSOR
SPRS462B – SEPTEMBER 2007 – REVISED JANUARY 2008
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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