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TNETV2685FIDZUT7 数据表(PDF) 39 Page - Texas Instruments |
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TNETV2685FIDZUT7 数据表(HTML) 39 Page - Texas Instruments |
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39 / 191 page  TMS320DM647 TMS320DM648 www.ti.com SPRS372H – MAY 2007 – REVISED APRIL 2012 3.2 Bootmode Registers The BOOTCFG and DSPBOOTADDR registers are described in the following sections. At reset, the status levels of various pins required for proper boot are stored within these registers. 3.2.1 Boot Configuration (BOOTCFG) Register Configuration pins latched at reset are presented in the BOOTCFG register accessible through the system module. This is a read-only register. The bits show the true latched value of the corresponding input at RESET or POR deassertion. This is desirable since the most important use of this MMR is for the user to debug/view the actual value driven on the pins during device reset. Figure 3-1. BOOTCFG Register 31 24 Reserved R-0 23 22 21 20 19 18 17 16 AECLKINSEL PC166 HPIWIDTH Reserved FASTBOOT Reserved DUHPIEN EMIFAWIDTH R-L R-L R-L R-L 15 8 Reserved R-0 7 4 3 0 Reserved BOOTMODE R-0 R-L LEGEND: R/W = Read/Write; R = Read only; -n = value after reset Table 3-2. BOOTCFG Register Field Descriptions Bit Field Value Description 31:24 Reserved Reserved 23 AECLKINSEL Controls the clock input for EMIFA. Latched from AECLKINSEL at RESET or POR deassertion 1 EMIFA clocked from internal SYSCLK 0 EMIFA clocked from outside from AECLKIN 22 PCI66 Controls PCI speed. PCI. Latched from PCI66 at RESET or POR deassertion 0 33 MHz PCI 1 66 MHz 21 HPIWIDTH Controls HPI bus width. Latched from HPIWIDTH at RESET or POR deassertion 0 16 bit 1 32 bit 20 Reserved 1 Reserved 19 FASTBOOT Fast Boot. Latched from FASTBOOT at RESET or POR deassertion 0 No Fast Boot 1 Fast Boot 18 Reserved Reserved 17 DUHPIEN PCI Enable Default. Latched from UHPIEN at RESET or POR deassertion 0 UHPI disabled 1 UHPI enabled 16 EMIFAWIDTH EMIFA CS2 Bus Width Default. Latched from EMIFAWIDTH at RESET or POR deassertion 0 8-bit 1 16-bit 15:4 Reserved Reserved Copyright © 2007–2012, Texas Instruments Incorporated Device Configuration 39 Submit Documentation Feedback Product Folder Link(s): TMS320DM647 TMS320DM648 |
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