IP-CPRI Altera, IP-CPRI Datasheet - Page 105

• Manufacturer Part Number: IP-CPRI
• Description: IP CORE - Common Public Radio Interface (CPRI)
• Manufacturer: Altera

Specifications of IP-CPRI

• Software Application: IP CORE, Interface And Protocols, HIGH SPEED
• Supported Families: Arria II GX, Cyclone IV GX, HardCopy IV, Stratix IV
• Core Architecture: FPGA
• Core Sub-architecture: Arria, Cyclone, Stratix
• Rohs Compliant: NA
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

Chapter 6: Software Interface
CPRI Interface Registers
Table 6–17. CPRI_RX_DELAY—Receiver Delay—Offset: 0x34
Table 6–18. CPRI_ROUND_DELAY—Round Trip Delay—Offset: 0x38
Table 6–19. CPRI_EX_DELAY_CONFIG—Extended Delay Measurement Configuration—Offset: 0x3C
Table 6–20. CPRI_EX_DELAY_STATUS—Extended Delay Measurement Status—Offset: 0x40
December 2010 Altera Corporation
RSRV
rx_buf_delay
rx_byte_delay [1:0]
Note to
(1) WIDTH_RX_BUF is the log
RSRV
rx_round_trip_delay
RSRV
rx_ex_delay
RSRV
rx_ex_buf_delay_valid
RSRV
rx_ex_buf_delay
Note to
(1) WIDTH_RX_BUF is the log
configurations, it is set to four, specifying a 16-entry buffer.
configurations, it is set to four, specifying a 16-entry buffer.
Field
Table
Table
Field
Field
Field
6–17:
6–20:
[31:(WIDTH_RX_BUF+2)]
[(WIDTH_RX_BUF+1):2]
[31:9]
[8:0]
Bits
2
2
of the depth of the Rx elastic buffer. In master configurations, it is set to six, specifying a 64-entry buffer. In slave
of the depth of the Rx elastic buffer. In master configurations, it is set to six, specifying a 64-entry buffer. In slave
[31:17]
[16]
[15:(WIDTH_RX_BUF+9)](1)
[(WIDTH_RX_BUF+8):0]
[31:20] UR0
[19:0]
UR0
RW
Access
Bits
Bits
RO
Access
Reserved.
Integration period for extended delay measurement.
Program this field with the user-defined value N, where
M/N = clk_ex_delay period / cpri_clkout period. Refer to
Receive Buffer Delay Calculation Example” on page
Bits
(1)
(1)
Reserved.
Measured round trip delay from cpri_tx_rfp to
cpri_rx_rfp. Unit is cpri_clkout clock periods.
Access
UR0
RO
RO
(1)
UR0
RC
UR0
RO
Access
Reserved.
Current receive buffer fill level. Unit is 32-bit words.
Maximum value is 2
Current byte-alignment delay.
Reserved.
Indicates that the rx_ex_buf_delay field
has been updated.
Reserved.
Extended delay measurement result. Unit
is cpri_clkout clock periods. Refer to
“Extended Rx Delay Measurement” on
page
Function
4–42.
Function
WIDTH_RX_BUF
Function
Function
CPRI MegaCore Function User Guide
4–43.
-1.
“CPRI
12'h0
20'h0
Default
Default
0
0
2'h0
Default
23'h0
9'h0
Default
15'h0
1'h0
0
0
6–9