
RELEASED
DATA SHEET
PM7366 FREEDM-8
ISSUE 4
PMC-1970930
FRAME ENGINE AND DATA LINK MANAGER
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
258
target stops driving the AD[31:0] bus and the initiator stops driving the C/BEB[3:0] bus. This shall
be the turnaround cycle for these signals.
Figure 35 – PCI Fast Back to Back
PCICLK
FRAMEB
AD[31:0]
C/BEB[3:0]
1
2
3
4
5
6
7
8
9
IRDYB
TRDYB
DEVSELB
T
Address
Data
Data
Byte En
Byte Enable
Bus Cmd
T
T
T
T
T
Address
Data
Bus Cmd
14.4 BERT Interface
The timing relationship between the receive link clock and data (RCLK[n] / RD[n]) and the receive
BERT port signals (RBCLK / RBD) is shown in Figure 36. The selected RCLK[n] is placed on
RBCLK after an asynchronous delay. The selected receive link data (RD[n]) is sampled on the
rising edge of the associated RCLK[n] and transferred to RBD on the falling edge of RBCLK.
Figure 36 – Receive BERT Port Timing
RCLK[n]
RD[n]
B1 B2 B3 B4 X B5 X X
X B6 B7 B8 B1 X
RBCLK
RBD
B1 B2 B3
B4
B5
B6 B7 B8
B1
The timing relationship between the transmit link clock and data (TCLK[n] / TD[n]) and the
transmit BERT port signals (TBCLK / TBD) is shown in Figure 37. TCLK[n] is shown to have an
arbitrary gapping. When TCLK[n] is quiescent, TBD is ignored (X in Figure 37). The selected
TCLK[n] is buffered and placed on TBCLK. The transmit BERT data (TBD) is sampled on the
rising edge of the TBCLK and transferred to the selected TD[n] on the falling edge of TCLK[n].