Altera Corporation
Reference Manual
2–13
October 2006
Cyclone II FPGA Starter Development Board
Development Board Components
Clock Circuit
The development board has four clock sources:
■
Two on-board oscillators produce 27 MHz and 50 MHz clock signals.
■
A SubMiniature version A (SMA) connector,
EXT CLK
, located near
the right bottom corner of the board enables an external clock source
to provide clocking.
■
Input through the USB-Blaster port can provide a 24 MHz clock.
Clock Circuit Schematic
Figure 2–7
shows the clock circuit schematic.
FL_ADDR[15]
PIN_AA12
FLASH Address[15]
FL_ADDR[16]
PIN_AB12
FLASH Address[16]
FL_ADDR[17]
PIN_AA20
FLASH Address[17]
FL_ADDR[18]
PIN_U14
FLASH Address[18]
FL_ADDR[19]
PIN_V14
FLASH Address[19]
FL_ADDR[20]
PIN_U13
FLASH Address[20]
FL_ADDR[21]
PIN_R13
FLASH Address[21]
FL_ADDR[0]
PIN_AB20
FLASH Address[0]
FL_ADDR[1]
PIN_AA14
FLASH Address[1]
FL_DQ[0]
PIN_AB16
FLASH Data[0]
FL_DQ[1]
PIN_AA16
FLASH Data[1]
FL_DQ[2]
PIN_AB17
FLASH Data[2]
FL_DQ[3]
PIN_AA17
FLASH Data[3]
FL_DQ[4]
PIN_AB18
FLASH Data[4]
FL_DQ[5]
PIN_AA18
FLASH Data[5]
FL_DQ[6]
PIN_AB19
FLASH Data[6]
FL_DQ[7]
PIN_AA19
FLASH Data[7]
FL_OE_N
PIN_AA15
FLASH Output Enable
FL_RST_N
PIN_W14
FLASH Reset
FL_WE_N
PIN_Y14
FLASH Write Enable
Table 2–8. Flash Memory FPGA Pin Connections (Part 2 of 2)
Signal Name
FPGA Pin
Description