Vax 613 0S Instruction Manual Page 207

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Note
The virtual ROM executive (REX) memory region is located at the bottom
of memory, and the TURBOchannel options expect the REX memory
region to reside in that physical location. For this reason the scatter
/gather registers need not be used to perform DMA.
14.4 Machine State Following Power-Up Initialization
Table 48 lists the values of several important registers following power-up
initialization.
Table 48 Register Values After Power-Up
Name Value Description
TURBOchannel ASIC Registers
Slot mode 0x00000000 Set up all TURBOchannel option slots to have
parity disabled, block mode disabled, and not
to use scatter/gather map.
Configuration 0x00000014 Page size of 8 KB and DMA magic number set
to 20 (decimal).
Failing address Don’t care This register is written to unlock the register.
Error Don’t care This register is written to unlock the register.
Interrupt 0x000000XX This register is read, so bits <31:21> can clear.
The TURBOchannel interrupt lines should also
be 0.
Scatter/Gather map 0x00000000 All registers should be invalid with a PPN of
0.
(continued on next page)
Powerup Initialization and Firmware Entry 14–7
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