Broadcom BCM7405 - Table 1-20: Power-On Strap Settings

2/24/2008 9T6WP
Preliminary Hardware Data Module BCM7405
06/29/07 Hardware Signal Descriptions
Broadcom Corporation
Document 7405-1HDM00-R Power-On Strap Settings Page 1-147
POWER-ON STRAP SETTINGS
Table 1-20: Power-On Strap Settings
Strap Bit Description Pin Default Comments
strap_reset_ext_
mode
Reset Extension Mode.
0: No delay
1: 200 ms (EBI_CS# delayed by 1.6
ms)
VO_656_4 0 –
strap_reset_outb_
def_val
0: Level reset output behavior
1: One shot reset output behavior
VO_656_CLK 1 One shot reset output
behavior is compatible to
BCM3560
strap_ddr_config_0 000: 64-bit UMA (MEMC0)
001: 32-bit UMA (MEMC0)
010: 16-bit UMA (MEMC0)
100: 32 +16 Non-UMA
(MEMC0:32-bit, MEMC1:16-bit)
101: 16 +16 Non-UMA
(MEMC0:16-bit, MEMC1:16-bit)
(LSB is 0, MSB is 2)
RMX_SYNC0 0 Configuration of 64-bit DDR
interface. Currently, 32-bit
UMA is NOT supported by
BCM7405.
strap_ddr_config_1 RMX_DATA0 0
strap_ddr_config_2 – USB1_PWRON 0 –
strap_ddr0_device_
config_0
00: 16Mx16 bit device on MEMC0
01: 32Mx16 bit device on MEMC0
10: 64Mx16 bit device on MEMC0
11: 128Mx16 bit device on MEMC0
RMX_CLK1 0 Device configuration of
MEMC0
strap_ddr0_device_
config_1
RMX_DATA1 0
strap_ddr1_device_
config_0
00: 16Mx16 bit device on MEMC1
01: 32Mx16 bit device on MEMC1
10: 64Mx16 bit device on MEMC1
11: 128Mx16 bit device on MEMC1
EBI_ADDR26 0 Device configuration of
MEMC1 (32 + 16 bit mode)
strap_ddr1_device_
config_1
EBI_ADDR27 0
strap_ebi_boot_
memory
0: Boot memory is 8-bit device
1: Boot memory is 16-bit device
RMX_CLK0 ? Per system configuration
strap_ebi_cs_swap 0: No swap
1: Swap CS_0 and CS_1 signals
EBI_DSb ? Per system configuration
strap_ebi_rom_size0 NOR FLASH:
0: 64Mbyte ROM
1: 16Mbyte ROM
2: 8MByte ROM
3: 4Mbyte ROM
(LSB is 0, MSB is 1)
NAND FLASH:
0: Enable ECC
1: Enable ECC
2: Disable ECC
3: Disable ECC
EBI_TSIZE0b ? Per system configuration
strap_ebi_rom_size1 – EBI_TSIZE1b – –