Manual
ibaLink-VME
62
Issue 1.8
Coherent Mode
When Coherent Mode is enabled, the output data is only sent to the fiber optic output
after setting the TX1/TX2 Commit bit in the Control Register 0xE8. Committing the TX
buffers should not happen faster than 10 µs!
When Coherent Mode is enabled, the input data is only updated to the last received data
after setting the RX1 Get bit in the Control Register 0xE8.
10.5
4K RX/TX buffers
These buffers are used to receive and transmit data for the 32Mbit Flex and 32Mbit P2P
Modes.
The buffers are 4K in size each. The format of these buffers depends on the mode.
10.5.1 32Mbit P2P
Within this mode there are 2 formats used: the free format where the data is considered
as a sequence of bytes (Range switch set to C or D) and the other standard 32Mbit
modes where the data is divided into analog (Integers or Reals) and digital bits.
Free format: up to the first 4024 bytes of the buffer are received/transmitted as is
Standard format: up to the first 2048 bytes are used to receive/transmit the analog
values. The endianess is according to the DIP switch setting. Starting at offset 3968
(0xF80) the digital bits are located (packed together in bytes).
Alternatively, binary data can be sent in “DWORD” format starting at offset 0x7000.
A DWORD is sent per bit with LSB = true/false. These binary data are
not
logically
linked by an OR function with the packed binary outputs (0xCF80).
10.5.2 32Mbit Flex
In 32Mbit Flex mode the complete 4K transmit buffer is available to store transmit data.
However, only a maximum of 4060 bytes could be selected for transmission on the fiber
optic. On the receive side a block of maximum 4060 bytes can be received.
The format of the data (endianess, bytes, reals, etc) should be configured in ibaPDA.
The endianess and REAL/INT DIP switches are not used in 32Mbit Flex mode.
