GR740-UM-DS, Nov 2017, Version 1.7 352 www.cobham.com/gaisler
GR740
Table 445.0x00 - BOOTSTRAP - Bootstrap register
31 26 25 24 23 22 21 20 19 18 17 16 15 0
RESERVED B
1
0
B9 B8 B7 B6 B5 B4 B3 B2 B1 GPIO
*
rw*
31: 26 RESERVED
25 Reset value of JTAG_TRST signal (B10) - The value in this register can be written but the changed
value does not affect system operation. This field is only available in GR740 silicon revision 1.
24 Reset value of DSU_EN bootstrap signal (B9) - The value in this register can be written but the
changed value does not affect system operation. This field is only available in GR740 silicon revi-
sion 1.
23 Reset value of BREAK bootstrap signal (B8) - The value in this register can be written but the
changed value does not affect system operation. This field is only available in GR740 silicon revi-
sion 1.
22 Reset value of PLL_BYPASS[2] bootstrap signal (B7) - The value in this register can be written but
the changed value does not affect system operation. This field is only available in GR740 silicon
revision 1.
21 Reset value of PLL_BYPASS[1] bootstrap signal (B6) - The value in this register can be written but
the changed value does not affect system operation. This field is only available in GR740 silicon
revision 1.
20 Reset value of PLL_BYPASS[0] bootstrap signal (B5) - The value in this register can be written but
the changed value does not affect system operation. This field is only available in GR740 silicon
revision 1.
19 Reset value of PLL_IGNLOCK bootstrap signal (B4) - The value in this register can be written but
the changed value does not affect system operation.
18 Reset value of PCIMODE_ENABLE bootstrap signal (B3) - The value in this register can be written
but the changed value does not affect system operation.
17 Reset value of MEM_CLKSEL bootstrap signal (B2) - The value in this register can be written but
the changed value does not affect system operation.
16 Reset value of MEM_IFWIDTH (B1) - The value in this register can be written but the changed
value does not affect system operation.
15: 0 Bootstrap value (BOOTSTRAP) - Bootstrap value of external general purpose I/O signal
GPIO(15:0). Writes to this register will override the current value of the bootstrap signals. Writes do
NOT affect the value of the external GPIO signal of the function of the GPIO port.
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