Altera ALTDLL - Manual (Page 42)

Chapter 4: Functional Description 4–6
ALTDQ_DQS Megafunction
© February 2012 Altera Corporation ALTDLL and ALTDQ_DQS Megafunctions User Guide
DQS Input Path
This path receives the DQS strobe signal from the external memory during read
operations.
Figure 4–3 shows the available blocks in the DQS input path.
Figure 4–3. DQS Input Path (Note 1) , (2)
Notes to Figure 4–3 :
(1) The dqs_input_data_in port must be connected to the output port of the input buffer.
(2) The dll_offsetctrlin , dll_delayctrlin , and dqsupdateen ports must be connected to the DLL.
DQS_INPUT_DELAY_CHAIN (D1)
DQS_DELAY_CHAIN
DQSBUSOUT_DELAY_CHAIN (Da)
dqs_input_data_in
dqs_enable_ctrl_hr_datainhi
dqsupdateteen
dll_offsetctrlin
core_delayctrlin
dqs_enable_in
dll_delayctrlin
dqs_enable_ctrl_clk
dqs_enable_ctrl_in
dqs_enable_ctrl_hr_datainlo
io_clk_divider_clk
io_clk_divider_masterin
DQS_ENABLE_CTRL
DQS_ENABLE_CTRL_HR_DDIO_OUT
IO_CLOCK_DIVIDER
DQS_ENABLE_DELAY_CHAIN (Db)
DQS_ENABLE
dqs_bus_out
io_clock_divider_clkout
io_clock_divider_slaveout
DQS_CONFIG
clkout
delayctrlin
oe
dqs_input_data_out
DQS Input Path