Model 466-1 Adapter
VMEbus Adapter Card Configuration 39
In Direct Mode, the
Bias
jumpers allow the following choices for the remaining
high-order address lines:
Set the VMEbus address bit to a "0".
Set the VMEbus address bit to a "1".
Extend VMEbus address range by passing more address bits from the SBus
to the VMEbus.
The VMEbus adapter cards are set at the factory to pass through all address bits.
To re-position the address in VMEbus memory, the jumpers must be changed.
The remote bus address generation process is shown below.
I/O Cable
SBus
Address (24 bits)
SBus
Adapter Card
VMEbus Address
Bits 15 - 01
VMEbus
Adapter Card
Bias
>
>
VMEbus Address
Bits 31 - 16
>
>
>
The
Bias
jumpers adjust addresses coming from across the cable -- not
addresses local to the adapter card. Also, the
Bias
jumpers are ignored
when Page Mode is selected. (In Page Mode, the upper 12 - 16 VMEbus
address bits are supplied by a Page Register on the VMEbus adapter card.
See section 1.9.)
Passing through address line A16 to VMEbus address line A16 allows the
adapter to address a 128K byte VMEbus block. Passing through address A17,
A18, A19, A20, A21, A22, and A23 to VMEbus address lines A17, A18, A19,
A20, A21, A22, and A23 extends the range to 256K, 512K, 1M, 2M, 4M, 8M,
and 16M bytes, respectively. Address lines A24 - A31 passed from the SBus
adapter card are always zero.
After the range is established, the remaining higher VMEbus address bits must
be jumpered to ground or left open to establish the VMEbus starting address. A
bit left unjumpered appears as a "1" on the target VMEbus address lines. A bit
jumpered to a ground pin appears as a "0" on the target VMEbus address lines.
Содержание 466-1
Страница 1: ...Model 466 1 Adapter Hardware Manual Connects a SBus Computer to a VMEbus System...
Страница 2: ...Model 466 1 Adapter ii...
Страница 24: ...Model 466 1 Adapter 14 Adapter Functions...
Страница 52: ...Model 466 1 Adapter 42 VMEbus Adapter Card Configuration...
Страница 70: ...Model 466 1 Adapter 60 CSR Accessed From The SBus...
Страница 88: ...Model 466 1 Adapter 78 Common Problems And Solutions...
Страница 106: ...Model 466 1 Adapter 96 Jumper Configuration Worksheets...
Страница 107: ...Model 466 1 Adapter Jumper Configuration Worksheets 97 D 1 SBus Adapter Card Worksheet J1...
Страница 108: ...Model 466 1 Adapter 98 Jumper Configuration Worksheets...
Страница 110: ...Model 466 1 Adapter 100 Jumper Configuration Worksheets...