Altera RLDRAM II Controller MegaCore Function - Manual (Page 20)

2–10 MegaCore Version 9.1 Altera Corporation
RLDRAM II Controller MegaCore Function User Guide November 2009
Block Description
● rldramii_dq[8:0] is captured by the delayed
rldramii_qk[0]
● rldramii_dq[17:9] is captured by the delayed
rldramii_qk[1]
● rldramii_dq[26:18] is captured by the delayed
rldramii_qk[2]
● rldramii_dq[35:27] is captured by the delayed
rldramii_qk[3]
■ QVLD is always captured by the delayed version of
rldramii_qk[0]
for the associated RLDRAM II device. In
Figure 2–6 there are four rldramii_qk[] signals. Only
rldramii_qk[0] per RLDRAM II device captures the associated
QVLD signal:
● rldramii_qvld[0] is captured by the delayed
rldramii_qk[0]
● rldramii_qvld[1] is captured by the delayed
rldramii_qk[2]
■ After the capture registers all captured read data is clocked off the
undelayed rldramii_qk[] signal that captures the QVLD signal
for a particular RLDRAM II device:
● All RLDRAM II 0 captured data is clocked off the undelayed
rldramii_qk[0]
● All RLDRAM II 1 captured data is clocked off the undelayed
rldramii_qk[2]
■ Only one capture_clk[] per attached RLDRAM II device is
output from the datapath:
● RLDRAM II 0 capture data is associated with
capture_clk[0]
, which is the delayed rldramii_qk[0]
● RLDRAM II 1 capture data is associated with
capture_clk[1]
, which is the delayed rldramii_qk[2]
Read Data Capture Clock Association
Figure 2–7 shows the read data and data strobes at the memory interface
for the example datapath in Figure 2–6 . Figure 2–8 shows how the
capture_clk[] associates with the captured read data,
control_rdata[] at the datapath interface.