The laser driver contains the axi_pulse_gen's IP and an additional
register map which controls/monitor the laser driver enable control line
and the over temperature warning line (OTW).
It also contains an interrupt logic, which allows to generate an
interrupt in function of the generated pulse or incoming OTW signal.
The IPs register maps looks as follow:
0x00 - axi_pulse_gen register map
0x80 - axi_laser_driver register map
0x80 - DRIVER_ENABLE
0x84 - DRIVER_OTW
0x88 - EXT_CLK_COUNTER
0xA0 - IRQ_MASK
0xA4 - IRQ_SOURCE
0xA8 - IRQ_PENDING
0xAC - SEQUENCER_CONTROL
0 - SEQUENCER_ENABLE
1 - AUTO_SEQUENCER_ENABLED
0xB0 - SEQUENCER_SYNC_OFFSET
0xB4 - AUTO_SEQUENCE
[ 1: 0] - CHANNEL_SEL_0
[ 5: 4] - CHANNEL_SEL_1
[ 9: 8] - CHANNEL_SEL_2
[13:12] - CHANNEL_SEL_3
0xB8 - MANUAL_SEQUENCE
[ 1: 0] - MANUAL_CHANNEL_SEL
Current interrupt sources scheme is:
- bit 0 : pulse (triggered by the level of the pulse)
- bit 1 : OTW_N enter (triggered by positive edge of the OTW_N)
- bit 2 : OTW_N exit (triggered by the level of the pulse)
Generate a reset signal before the pulse which can be used to reset
various IP's of the data path (eg. pack/cpack). This can help to clear out the
internal buffers and registers of these IP, starting clean at the moment when
the actual pulse arrives.
The sequencer has an auto and a manual mode, and can be set to custom
sequences of the TIA channel selection lines sate.
The sequencer in auto mode is synchronized to the pulse, it will change
its state before a generated pulse which will drive the lasers. The
offset between the sequencer beat and the laser driver pulse can be
modified through an AXI register.
Istvan Csomortani