2/24/2008 9T6WP
BCM7405 Preliminary Hardware Data Module
Hardware Signal Descriptions 06/29/07
Broadcom Corporation
Page 1-148 Power-On Strap Settings Document 7405-1HDM00-R
strap_ebi_invert_addr 0: Do not invert EBI address
1: Invert upper bits of EBI address
EBI_RDb 1
strap_boot_rom_type 0: Boot ROM is NOR Flash
1: Boot ROM is NAND Flash
EBI_WE1b ? TBD
strap_pci_client 0: PCI in bridge (master) mode
1: PCI in client (slave) mode
VO_656_0 0 Usually in master mode
strap_pci_memwin_
size_0
0: 512 Mbyte Window
1: 1 Gbyte Window
2: 128 Mbyte Window
3: 256 Mbyte Window
(LSB is 0, MSB is 1)
VO_656_3 ? Per memory configuration
strap_pci_memwin_
size_1
– DAA_AOUT – –
strap_pci_memwin1_e
n
0: Disable PCI memory window 1
1: Enable PCI memory window 1
VO_656_1 ? Per system configuration
strap_pci_memwin2_e
n
0: Disable PCI memory window 2
1: Enable PCI memory window 2
VO_656_2 ? Per system configuration
strap_external_MPI_
arbit
0: Use internal MPI arbiter
1: Use external MPI arbiter
EBI_WE0b 0 Per system configuration
strap_CPU_freq_0 0: 297 MHz
1: 324 MHz
2: 351 MHz (default)
3: 378 MHz
4: 405 MHz
5: 432 MHz
6: 459 MHz
7: 148.5 MHz (297 divided by 2)
EBI_ADDR25 0 Per system configuration
3'b010 is the recommended
default
strap_CPU_freq_1 – EBI_RWb 0 Per system configuration
strap_CPU_freq_2 – EBI_ADDR24 ? Per system configuration
strap_NMI_polarity 0: Low-active interrupt
1: High-active interrupt
EBI_TSb ? Per system configuration
strap_test_debug_en_
0
0: Debug Mode Disabled VO_656_5 0 Internal Debug Port
strap_test_debug_en_
1
VO_656_6 0 –
strap_spi_slave_
enable
0: BSC slave port configured
1: SPI slave port configured
IR_OUT 0 Per system configuration,
usually in BSC slave
strap_system_big_end
ian
0: System is LITTLE endian
1: System is BIG endian
RMX_SYNC1 ? Per system configuration
strap_USB_mode 0: 3rd USB is host mode
1: 3rd USB is client mode
AUD0_SPDIF 0 Per system configuration
strap_RSVD_1 USB0_PWRON 0 Per system configuration
strap_33_27_MHz_
clock
0: 27-MHz clock output
1: 33-MHz clock output
VO_656_7 1 Per system configuration
Table 1-20: Power-On Strap Settings
Strap Bit Description Pin Default Comments
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