7 SIGNAL REFERENCE
This chapter gives you a complete reference to all the signals the VBT - 325 is
working with.
VMEbus Signal Groups
Group name S i g n a l s included in group
Address A 0 1 -A31,
plus
DS1*
acting as virtual A00.
Data D O O - D 3 1
DataASCII D O O - D 3 1 , decoded as ASCII.
Byte values not in the range 0x20 - 0x7E are
displayed as "." (a dot).
BgL
B G 3 - 0 * internally latched.
The "BgL" group contains latched bus grant
information (latched on falling edge of BBSY*), displayed as ---0, - 2 - - , 3-
-- for the four possible bus levels. BgL will show ---- if no bus grant was seen
by the VBT-325 (due to position of VBT-325 in the daisy chain).
Size A 0 1 , DS1*, DSO*, LWORD*.
The control signals DS1*, DSO*, LWORD* are
combined into the group called "Size". This group also takes into account the
address bit A01, since this bit, together with the ones mentioned above
determine the transfer size and the data aligning on the VMEbus.
Cycl
I A C K * , AMO, AM1, WRITE*.
The "Cycl" group contains the bus signals that
define the current cycle type. The internally generated bit "_RMW" is also
included in this group, set during Read-Modify-Write and Block cycles (in
second cycle). Together with address modifier bits 1,0 (AM1, AMO), this field
can be used directly to set mnemonics for Read, Write, RMW and Block cycles.
Also, IACK* is included to select Interrupt Acknowledge cycle type.
Status D T A C K * , BERR*.
The "Status" group consists of DTACK* and BERR*, with
the mnemonics OK (equals to DTACK* = 0 and BERR* = 1), and ERR (equals
to DTACK* = 1 and BERR* = 0).
Fail A C F A I L * , SYSFAIL*
The "Fail" group contains the two VMEbus fail
signals ACFAIL* and SYSFAIL*. These are available as a group to occupy
less screen space horizontally, but the signals may also be shown individually
as SYSF* and ACF*.
In3:0
T h e s e are the external inputs in the mini-coax connector on the front panel.
Note that
Inl
is shared with the temperature probe, so if the probe is used,
Inl
is not available. (Determined by jumper J66 and "V+T, V" jumper, see under
"LED Display" in the "COMMANDS REFERENCE" section). Also note that
In3:0 is
not available in the trace if
Extended Time Tag
is selected with the
VMETRO
V
B
T
-
3
2
5
User's Manual
1
0
3
Summary of Contents for VBAT-PB
Page 15: ...x i v 1 1 I 1 1 I I i i I I 1 I I 1 I 1 I I ...
Page 23: ...1VBT 325 Product overview 8 V B T 3 2 5 User s Manual V M E T R O ...
Page 125: ...8 Trace examples 110 V B T 3 2 5 User s Manual V M E T R O ...
Page 144: ...9 VBAT PB VME bus anomaly trigger ITP40 I GND VMETRO V B T 3 2 5 User s Manual 1 2 9 ...
Page 159: ...1 1Jumper settings 144 V B T 3 2 5 User s Manual V M E T R O ...
Page 181: ...16 Simulator for PC 166 V B T 3 2 5 User s Manual V M E T R O ...