Rev 1.1 | SC5317A & SC5318A
Hardware Manual
SignalCore, Inc.
6
SC5317A & SC5318A Hardware Manual
Single Byte Write
The serial transfer buffer register address is located at 0x00 offset from BAR0 of the bridge chip, however
before writing byte data to this register its status needs to be checked to confirm that it is ready to accept
a new buffer of bytes. The status register is located at 0x05, and it must be read and bit 7 must be high to
indicate that the transfer register is ready to receive the next byte buffer. Checking the status register of
the serial bridge chip is required before every new command write.
Device Register Write
The process of writing the device registers is the same as writing a RS232 port, so the description of
Section 5.4.1 is applicable. Writing the device registers involves sending byte-by-byte data as described
previously. Section 4.1 provides information on the number of configuration write bytes needed for each
device register. The first byte sent is the device register address, followed by the most significant byte of
the register’s associated data. When a device register is fully written, that is, all its data has been sen
t to
the device, it will return 1 byte. This returned byte must be read (by the host) to clear the transfer buffer
so that later received data are not corrupted. Section 5.5.3.1 describes how a byte read cycle is
performed.
Reading from the Device
Device data is passed back to the host via the bridge chip byte-by-byte, so we will discuss a single byte
read process and an entire register read process.
Single Byte Read
The serial transfer buffer register address is located at 0x00 offset from BAR0 of the bridge chip. Before
valid data can be read from the transfer register, its ready status must first be confirmed. The status
register is located at 0x05, and it must be read and bit 0 must be high to indicate that valid data is
available. Checking the status register for available data is required before every byte read.
Device Register Read
After a
write request
to the device is made, 8 bytes of data is available to be read back. Use the single
byte read process, as mentioned previously, to read all the bytes. See Section 4.2 for information of the
exact number of request write bytes, and the number of request read bytes, which is 8. All 8 bytes must
be read to fully clear the transfer buffer, the first byte read is the most significant byte.
6
Calibration
Calibration EEPROM Map
represents the EEPROM map of the device calibration values. All values are stored as little-
endian 4-byte floating point numbers. Every point is 4-bytes long. Access to the data is possible through
the CAL_EEPROM_READ register, which reads 8 bytes starting at the address pointed to by the register
input.