PM7311 pmc-sierra, PM7311 Datasheet - Page 265

• Manufacturer Part Number: PM7311
• Description: Freedm 84a1024l Assp Telecom Standard Datasheet
• Manufacturer: pmc-sierra

Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2021832, Issue 2
14.4 Transmit Link Timing
14.5 Receive APPI Timing (Any-PHY Level 2)
RXADDR[3:0]
The timing relationship of the transmit clock (TCLK[n]) and data (TD[n]) signals is shown in
Figure 41. The transmit data is viewed as a contiguous serial stream. There is no concept of
time-slots or framing. Every eight bits are grouped together into a byte with arbitrary byte
alignment. Octet data is transmitted from most significant bit (B1 in Figure 41) and ending with
the least significant bit (B8 in Figure 41). Bits are updated on the falling edge of TCLK[n]. A
transmit link may be stalled by holding the corresponding TCLK[n] quiescent. In Figure 41, bits
B5 and B2 are shown to be stalled for one cycle while bit B6 is shown to be stalled for three
cycles. In Figure 41, the quiescent period is shown to be a low level on TCLK[n]. A high level,
effected by extending the high phase of the previous valid bit, is also acceptable. Gapping of
TCLK[n] can occur arbitrarily without regard to byte or frame boundaries.
Figure 41 Transmit Link Timing
The receive Any-PHY packet interface (APPI) timing is shown in Figure 42 through Figure 45
when the Any-PHY interface operates at 52 MHz, 16 bits of RXDATA are valid. The FREEDM
84A1024L device provides data to an external controller using the receive APPI. The following
discussion surrounding the receive APPI functional timing assumes that multiple FREEDM
84A1024L devices share a single external controller. All Rx APPI signals are shared between the
FREEDM 84A1024L devices
Figure 42 Receive APPI Timing (Normal Transfer 16 bit 52 MHz)
XDATA[15:0]
Figure 42 shows the transfer of an 8 word packet across the Rx APPI from FREEDM 84A1024L
device 0, Any-PHY channel 2. In this example, seven FREEDM 84A1024L devices are sharing
the Rx APPI, with device 5 being the null address.
RXCLK
RMOD
REOP
RERR
RENB
RSOP
RVAL
RPA
RSX
Dev 0
NULL
Dev 7
Dev 0
TCLK[n]
NULL
CH 2
TD[n]
Dev 6
Dev 7
D0
FREEDM 84A1024L ASSP Telecom Standard Product Data Sheet
Dev 0
Dev 0
NULL
B1 B2 B3 B4
D1
Dev 6
Dev 4
D2
NULL
B5
D3
Dev 0
Dev 4
B6
NULL
B7 B8 B1
Dev 1
Dev 0
NULL
B2
D4
Dev 3
Dev 1
D5
Dev 0
Dev 0
NULL
D6
Dev 2
Dev 3
D7
Released
265
NULL
Dev 2