Broadcom BCM91250A User Manual page 24

BCM91250A
Board ID Function
J6 32-bit PCI clock
select
J7 64-bit PCI clock
select
J31 ROM/Emulator select
J40 JTAG chain config
J43 Manual warm reset
switch enable
J61 MAC 0 PHY JTAG
select
J62 MAC 1 PHY JTAG
select
J71 JTAG chain config
Page 18 Jumpers
Table 6: Jumper Descriptions
Settings
open = run at slowest PCI agent
1-2 = force 33 MHz
2-4 = force 66 MHz
1-2, 3-4 = disable clock generator
open = run at slowest PCI agent
1-2 = force 33 MHz
2-4 = force 66 MHz
1-2, 3-4 = disable clock generator
open = CS0 is Flash, CS1 is ROM
Emulator
1-2 = CS0 is ROM Emulator, CS1 is ROM
1-2, 17-18 = BCM1250 only
3-4, 19-20 = CPLD only
(other settings are unsupported)
open = disabled
1-2 = enabled
open = normal
1-2 = enable JTAG
open = normal
1-2 = enable JTAG
open = enable BCM1250 and PHY JTAG
rings
1-2 = enable all other JTAG rings
(NOTE: Other jumpers (J40, J61, J62)
must be set as well to enable the desired
JTAG functionality)
B roadc om C or por ati on
(Cont.)
Default
run at slowest PCI agent
run at slowest PCI agent
CS0 is Flash, CS1 is ROM
Emulator
BCM1250 only
enabled
normal (JTAG disabled)
normal (JTAG disabled)
enable BCM1250 and PHY JTAG
rings
Document
User Manual
05/18/04
91250A-UM100-R