Altera Serial Digital Interface (SDI) MegaCore Function - Manual (Page 61)

Chapter 3: Functional Description 3–31
Block Description
February 2013 Altera Corporation Serial Digital Interface (SDI) MegaCore Function
User Guide
Figure 3–19 shows the block diagram of how the SDI MegaCore function and the
ALT2GXB_RECONFIG megafunction are connected.
The ALT2GXB_RECONFIG block handles the programming of the ROM contents into
the transceiver megafunction. It performs data serialization and also handles
protection of certain data bits in the serial stream. You can only connect this block to
the reprogramming ports of the transceiver instance.
The ROM holds the transceiver setting information for the 3G-SDI video standard. As
the setup for SD-SDI is similar to 3G-SDI, only two settings are required: one for
SD-SDI and 3G-SDI, and one for HD-SDI.
The reconfiguration control and intercept user logic selects the correct transceiver
setting and also provides the handshaking between the SDI MegaCore function and
the ALT2GXB_RECONFIG block. The logic modifies the ROM read data when it reads
word 23 for all devices, barring Arria II GX and Stratix IV devices. For Arria II GX and
Stratix IV devices, the logic modifies the ROM read data when it reads word 29. For
examples, refer to the intercept logic,
example\s2gx_tr\source\sdi_dprio\sdi_mif_intercept.v
and
example\a2gx_tr\source\sdi_dprio_siv\sdi_mif_intercept_siv.v .
Figure 3–19. Transceiver Dynamic Reconfiguration for Receiver Block Diagram
Note to Figure 3–19 :
(1) The SDI_START_RECONFIG and SDI_RECONFIG_DONE signals are not connected to the SDI MegaCore transmitter.
ALT2GXB
RECONFIG_INST
RECONFIG Control
and Intercept
User Logic
ALT2GXB_INST
Protocol
SDI IP Core - Receiver
RECONFIG_TOGXB[2:0]
ROM_CLK_ENABLE
ROM_ADDRESS
ROM_DATA_OUT
if (ROM_ADDRESS = RX PMA)
select_hd
User Logic
Encrypted RECONFIG Megafunction
Encrypted SDI IP Core
HD: M, L value
3G/SD: M, L value
ROM (Hold MIF)
3G by default
1
0
0
1
RECONFIG_FROMGXB[0]
SDI_RECONFIG_DONE (1)
SDI_START_RECONFIG (1)
RX_STD
ALT2GXB_INST
Protocol
SDI IP Core - Duplex
ALT2GXB_INST
Protocol
SDI IP Core - Transmitter