![Altera HSMC Reference Manual Download Page 15](http://html1.mh-extra.com/html/altera/hsmc/hsmc_reference-manual_2910795015.webp)
Chapter 2: Board Components and Interfaces
2–9
Component Interfaces
© November 2008
Altera Corporation
Data Conversion HSMC Reference Manual
A/D Converter Clocks
Figure 2–5
shows the components involved in selecting the clock signal to be sent to
the AD9254 A/D converter (U1 for channel A, U2 for channel B). J3 (channel A) or J7
(channel B) selects the A/D clock from the FPGA clock A, the FPGA clock B, or the
external SMA clock (J26 and J30). The selected A/D clock passes through a differential
to LVDS clock multiplexer (U9 for channel A, U10 for channel B), which provides the
clock signal to the AD9254.
ADB_D4
68
D4
3
Data Output Bit 4
ADB_D5
66
D5
4
Data Output Bit 5
ADB_D6
62
D6
5
Data Output Bit 6
ADB_D7
60
D7
6
Data Output Bit 7
ADB_D8
56
D8
9
Data Output Bit 8
ADB_D9
54
D9
10
Data Output Bit 9
ADB_D10
50
D10
11
Data Output Bit 10
ADB_D11
48
D11
12
Data Output Bit 11
ADB_D12
44
D12
13
Data Output Bit 12
ADB_D13
42
D13
14
Data Output Bit 13
ADB_OR
84
OR
15
Out-of-Range Indicator
AD_SDIO
91
SDIO/DCS
18
Serial Port Interface (SPI) Data
Input/Output (Serial Port Mode)
AD_SCLK
92
SCLK/DFS
19
Serial Port Interface Clock (Serial Port
Mode)
ADB_SPI_CS
90
CSB
20
Serial Port Interface Chip Select
(Active Low)
ADB_OE
86
OEB
43
Output Enable (Active Low)
ADB_DCO
158
DCO
44
Data Clock Output
—
—
ADB_CLK_P
38
(1)
Clock Input
—
—
ADB_CLK_N
39
(2)
Clock Input
—
—
ADB_PWDN
36
(3)
Power-Down Function Select
Notes to
Table 2–11
:
(1) This pin is connected to Multiplexer pin U10.15.
(2) This pin is connected to Multiplexer pin U10.14.
(3) This pin is connected to Jumper pin J6.2.
Table 2–11.
A/D Converter Channel B (U2) Pin-Out Information (Part 2 of 2)
HSMC Signal
HSMC Pin
Device Signal
Device
Pin Number
Description