Texas Instruments ADS8364EVM, User Manual, Page: 18 / 28

Control Signals
3-2
3.1 Control Signals
The ADS8364EVM was developed on the TMS320C6711 DSK platform. The
HOLDx signals, ADD pin control, and reset are all derived from the GPIO
function of McBSP port 1. These signals are located on J12. The address and
data lines are available on J11. The EVM is factory configured to use address
0xA000 0020 as its base. Channel A0 can be accessed from this location, with
channels A1 through C1 located at the base a 0x04, as listed in Table
3 - 1.
An alternate address base can be selected by removing the shunt jumper on
W17. This assigns A17 or 0xA002 0000 as the base address of the EVM. In
this configuration, channels A1 through C1 are located at the base a
0x4000.
Table 3 - 1. Address Map
W17 CLOSED W17 OPEN
A0 0xA000 0020 0xA002 0000
A1 0xA000 0024 0xA002 4000
B0 0xA000 0028 0xA002 8000
B1 0xA000 002C 0xA002 C000
C0 0xA000 0030 0xA003 0000
C1 0xA000 0034 0xA003 4000
Cycle 0xA000 0038 0xA003 8000
FIFO 0xA000 003C 0xA003 C000
3.2 Bus Width
The ADS8364 features a byte mode in which data can be read from the ADC
in two consecutive 8-bit reads. W16 controls the byte feature, which is disabled
by default. To enable byte mode, remove the jumper from W16. Please consult
the data sheet for a complete description of byte mode operation.
3.3 External Clock
The BNC connector (J9) and W15 allow for the selection of an external
conversion clock source. Factory default settings provide the clock source via
the TOUT1 signal of the DSP by placing a shunt jumper on pins 1 and 2 of W15.
By moving the shunt to pins 2 and 3, the EVM user can apply an external clock
source of not more than 5 MHz to J9.