AXM-VFX-EDK User’s Manual Mezzanine Board
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Acromag, Inc. Tel:248-295-0310 Fax:248-624-9234 Email:[email protected] http://www.acromag.com
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This memory map reflects byte accesses using the “Little Endian” byte
ordering format. Little Endian uses even-byte addresses to store the low-
order byte. The Intel x86 family of microprocessors uses “Little Endian” byte
ordering. Big Endian is the convention used in the Motorola 68000
microprocessor family and is the VMEbus convention. In Big Endian, the
lower-order byte is stored at odd-byte addresses.
Board Status and Software Reset Register (Read/Write) –
(P 8000H)
This read/write register is used the issue a software reset, view and clear
pending interrupts, and to identify the attached module. It may also provide
other functions that are defined by the base board. Writing a “1” to bit 31 of
this register will cause a software reset effecting both the PMC base board
and the EDK registers. Bits 15 to 13 are used for AXM identification code.
Bits 0 to 7 or this register reflect the status of each of the Differential I/O
channels 8 to 15. A
Read
of this bit reflects the interrupt pending status.
Read of a “1” indicates that an interrupt is pending for the corresponding
differential channel.
Write
of a logic “1” to this bit will release the
corresponding differential channel’s pending interrupt. Writing “0” to a bit
location has no effect, a pending interrupt will remain pending.
BIT FUNCTION
0
Differential Channel 8 Interrupt Pending/Clear
1
Differential Channel 9 Interrupt Pending/Clear
2
Differential Channel 10 Interrupt Pending/Clear
3
Differential Channel 11 Interrupt Pending/Clear
4
Differential Channel 12 Interrupt Pending/Clear
5
Differential Channel 13 Interrupt Pending/Clear
6
Differential Channel 14 Interrupt Pending/Clear
7
Differential Channel 15 Interrupt Pending/Clear
12-8
Reserved for PMC base board
3
AXM Identification bits
1,2
(Read Only)
AXM-D
“001”
15-13
AXM-EDK
“001”
30-16
Reserved for PMC base board
3
31
Software Reset (Write Only)
1. Note that if no AXM module is attached the register will still read
“001”. It is up to the end user to differentiate if no mezzanine module
is attached.
2. All other 3 bit values are reserved for future use.
3. Bit function is defined by the base PMC Module.
This register can be written with either 8-bit, 16-bit, or 32-bit data
transfers.
BOARD STATUS AND
RESET REGISTER