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TMS320DM640 数据表(PDF) 74 Page - Texas Instruments |
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TMS320DM640 数据表(HTML) 74 Page - Texas Instruments |
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74 / 171 page  Device Configurations 74 June 2003 − Revised August 2004 SPRS222C 2.4 Device Status Register Description The device status register depicts the status of the device peripheral selection. For the actual register bit names and their associated bit field descriptions, see Figure 2−5 and Table 2−6. 31 24 Reserved R-0 23 16 Reserved R-0 15 14 13 12 11 10 9 8 Reserved MAC_EN Reserved Reserved Reserved R-0 R-x R-0 R-x R-0 76 54 3 21 0 Reserved CLKMODE1 CLKMODE0 LENDIAN BOOTMODE1 BOOTMODE0 AECLKINSEL1 AECLKINSEL0 R-x R-x R-x R-x R-x R-x R-x R-x Legend: R = Read only; R/W = Read/Write; -n = value after reset Figure 2−5. Device Status Register (DEVSTAT) Description − 0x01B3 F004 Table 2−6. Device Status (DEVSTAT) Register Selection Bit Descriptions BIT NAME DESCRIPTION 31:12 Reserved Reserved. Read-only, writes have no effect. 11 MAC_EN EMAC enable bit. Shows the status of whether EMAC peripheral is enabled or disabled (default). 0 = EMAC is disabled, and the module is powered down (default). 1 = EMAC is enabled. 10:7 Reserved Reserved. Read-only, writes have no effect. 6 CLKMODE1 Clock mode select bits Shows the status of whether the CPU clock frequency equals the input clock frequency X1 (Bypass), x6, or x12. Clock mode select for CPU clock frequency (CLKMODE[1:0]) 00 – Bypass (x1) (default mode) 5 CLKMODE0 00 – Bypass (x1) (default mode) 01 − x6 10 − x12 11 − Reserved For more details on the CLKMODE pins and the PLL multiply factors, see the Clock PLL section of this data sheet. 4 LENDIAN Device Endian mode (LEND) Shows the status of whether the system is operating in Big Endian mode or Little Endian mode (default). 0 – System is operating in Big Endian mode 1 − System is operating in Little Endian mode (default) 3 BOOTMODE1 Bootmode configuration bits Shows the status of what device bootmode configuration is operational. Bootmode [1:0] 00 – No boot (default mode) 2 BOOTMODE0 00 – No boot (default mode) 01 − HPI [DM641 only]; Reserved [For DM640 device] 10 − Reserved 11 − EMIFA boot |
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