Excalibur Excalibur EPXA1, Справочник по аппаратуре

Страница: 22 / 50

22 Altera Corporation
EPXA1 Development Board Hardware Reference Manual
Difference Between Standard and Long Expansion Headers
On the standard expansion header, there is an RC-filtered connection to
EPXA1 device I/O pin AB5 from header pin J11.3. This circuit is suitable
for producing a high-impedance, low-precision analog output if the
appropriate pin is driven with a duty-cycle-modulated waveform by user
logic. However, there is no RC-filtered connection to an EPXA1 device
I/O pin from the long expansion header. Instead, header pin J4.3 supports
an additional user I/O.
EPXA1 Device Signal Definitions for the Expansion Headers
Table 13 on page 22 shows the definitions for the EPXA1 device signals
available to the standard expansion header interface. The definitions are
used with Altera daughter cards. The general purpose I/O signals can be
used as required.
See Table 24 on page 34 for standard expansion header pin-out details.
The long expansion header includes the signals in Table 13 , plus the
additional signals in Figure 14 .
Table 13. Standard Expansion Header Signal Definitions
Function Signals Number
General purpose I/O
H5V_IO[40..0]
41
Clock
H5V_OSC
H5V_CLK
H5V_CLKOUT
3
Bias voltage input
H5V_VEE
1
Reset
H5V_RST_N
1
Supply voltage
VCC_5V
VCC_A
VCC_3V3
1
1
3
Table 14. Additional Signal Definitions for the Long Expansion Header
Function Signals Number
Address
eup_A[15..0]
16
Data
eup_D[15..0]
16
Supply voltage
VCC_5V
VCC_A2
VCC_3V3
1
1
2