17
3
TDO
Data Output of the last JTAG
device
4
RTEST
JTAG runtest is running
7:5
8
ENABLE
drives signal to the JTAG Connector, the connector
must be free
9
AUTO_CLK
one clock cycle is generated, rising and falling
edge
With bit 8 set TDI, TMS and TCK in JTAG connector are driven from FPGA.
Otherwise these signals are high impedance, in order for an external
programming tool to be able to connect. By means of this register it is possible to
enable a program to gain full control over the JTAG chain.
jtag_data
0x034 - This register has two functions:
a)
With the read function the user gets the shift register for TDO. In orden not to
have to read jtag_csr after each output, the TDO bit is moved to a write
register with each cycle, so that the last 32 TDO bits (e. g. Device ID) can be
read out in chain.
b)
With the write function a number of TCK Clocks with TMS=0 is returned.
The value is used in svf Files as "RUNTEST n TCK". In this way it is possible
to insert pauses after commands.
tp_dac
0x01C - With bit 3 in “act” register it is possible to generate a test pulse through a
DAC. The height of the test pulse is set by means of this td_dac register. Since the
DAC has 8 bits, only bits 11:4 are relevant.
offset_dac[4]
0x020 - (Not in all AVM16 version implemented). When no signal is connected,
the ADC mean output value is about 0x800, i.e. a signal in one polarity can use
only half of the measurement range. By means of an offset value for a DAC, it is
possible to reduce this ADC mean value until zero. For this purpose there are 4
DACs with 12 bit each for 4 channels. The DAC (AD5324) has the following
register assignments:
Bit
Name
Function (WO)
11-0
DATA
12 bit fffset, one unit corresponds to about one
ADC unit, i.e. when the value here is increased
by 0x100, the ADC mean value when no signal is
present should decrease more or less by the same
value.
12
nLDAC
If this bit is 0, all 4 channels are updated.
Otherwise, the data value is only temporarily
saved with no effect. This bit is always set to 0
internally.
30
15
16
0
TDO
31
15
16
0
TCK shift
jtag_data
Summary of Contents for AVM16
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