Filter
Top Products
Theory of Operation
3-42
2715 Spectrum Analyzer Service Manual
PEAKDIS_L. In the Normal Mode this bit selects one of the two acquisition
modes. Either the Max Peak, when low, or the Min/Max algorithm when high. In
the Enhance Mode this bit is used in conjunction with the ACQM0 bit of Mode
Control Register 2 to invoke Sample and Min Peak algorithms. See Table 3--3
below.
HLF/FLL_L. In the Normal Mode this bit selects one of two positions on the
CRT screen to normalize the B,C--Save A display. When this bit is low, the
B,C--Save A display will be normalized to the top of the CRT screen. When this
bit is high, the B, C--Save A display will be normalized to the middle of the
screen. In the Enhanced Mode this bit is used in addition to the POS1 bit in
Mode Control Register 2. See Mode Control Register 2 below for more details.
ACQ_ON. This bit asynchronously enables/disables the storing of vertical data
into the waveform memory. When this bit is high, the vertical data will be stored
in waveform memory. When this bit is low, the vertical data will not be stored in
waveform memory. It is important to understand that the A/D converter is still
running and the vertical data processing sections are still running. All that this
bit does is control the ability to store the vertical data after being processed.
RDZEN. This bit is not used in the Display Storage board.
DS_PROTECT. This bit is not used in the Display Storage board.
Mode Control Register 2. Mode Control Register 2 is located in I/O space, at
location 0x0FA04. Mode Control Register 2 is a read/write register.
In order to write to this register, it must first be enabled by setting the MCREG2
bit (bit 7) of the Scroll Register high. If at any time the MCREG2 bit is cleared
(set low) Mode Control Register 2 will be cleared and disabled.
Table 3- 3: Mode Control Register 2
Bit
Number
Mnemonic
Activity
Level
Description
7 Not used
6 Not used
5 Not used
4 Not used
3 Not used
2 ENB2715 High Enables features available in 2715 instrument
1 POS1 High MSB of B,C--Save A waveform position
0 ACQM0 High LSB of acquisition mode control
ENB2715. This bit, when high, enables the Enhanced Mode of the board.