Altera CPRI v6.0 MegaCore Function - Manual (Page 67)

Accessing the Hyperframe Control Words
When you turn on Enable all control word access in the CPRI v6.0 parameter editor, you can access the
256 control words in a hyperframe through the CPRI v6.0 IP core CPU interface. The
CTRL_INDEX
register
and the
RX_CTRL
register support your application in reading the incoming control words, and the
L1_CONFIG
register,
CTRL_INDEX
register, and
TX_CTRL
register support the application in writing to
outgoing control words.
Register support provides you access to the full control word. Alternatively, in timing-critical applications,
you can access the full control words through the CPRI v6.0 IP core AUX interface or other dedicated
direct interfaces.
Note: Altera recommends that you use the CPU interface to access the hyperframe control words only in
applications that are not timing-critical.
Specifying the Control Word
Figure 3-27: Subchannels in a Hyperframe
Illustrates how the 256 control words in the hyperframe are organized as 64 subchannels of four control
words each. The figure illustratres why the index X of a control word is Ns + 64 + Xs, where Ns is the
subchannel index and Xs is the index of the control word within the subchannel.
Xs == 0123
Ns == 0 0: K28.5 Synchronization and Timing
1 1: HDLC link 65: HDLC 129: HDLC 193: HDLC
2 2: L1 In-band 66: L1 in-band 130: L1 in-band 194: P (20 = 0x14)
3 3: Reserved 67: Reserved
4 4: Ctrl_AxC ... ... ...
...
7 7: Ctrl_AxC 71: Ctrl_AxC 135: Ctrl_AxC 199: Ctrl_AxC
...
14 14: Reserved
15 15: Reserved 79: Reserved 143: Reserved 207: Reserved
16 Vendor-specific
...
19
20
Pointer P --->
20: Ethernet
...
62 62 126 190 254
63 63 127 191 255
The
rx_ctrl_x
and
tx_ctrl_x
fields of the
CTRL_INDEX
register hold the X value of the control word you
want to access through the control and status interface.
UG-01156
2014.08.18
Accessing the Hyperframe Control Words 3-37
Functional Description Altera Corporation
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