DK-DEV-4SGX230N Altera, DK-DEV-4SGX230N Datasheet - Page 469

• Manufacturer Part Number: DK-DEV-4SGX230N
• Description: KIT DEVELOPMENT STRATIX IV
• Manufacturer: Altera
• Series: Stratix® IVr
• Type: FPGAr

Specifications of DK-DEV-4SGX230N

• Contents: Development Board, Universal Power Supply, Cables and Software
• Silicon Manufacturer: Altera
• Core Architecture: FPGA
• Core Sub-architecture: Stratix
• Silicon Core Number: EP4S
• Silicon Family Name: Stratix IV GX
• Rohs Compliant: Yes
• For Use With/related Products: EP4SGX230K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 544-2594

Chapter 1: Transceiver Architecture in Stratix IV Devices
Transceiver Block Architecture
Figure 1–20. 8B/10B Encoder Output During tx_digitalreset Assertion
February 2011 Altera Corporation
1
1
tx_digitalreset
dataout[9:0]
For example, depending on the current running disparity, the invalid code K24.1
(tx_datain = 8'h38 + tx_ctrl = 1'b1) can be encoded to 10'b0110001100 (0 × 18C),
which is equivalent to a D24.6+ (8'hD8 from the RD+ column). Altera recommends
that you do not assert tx_ctrlenable for unsupported 8-bit characters.
The tx_digitalreset signal resets the 8B/10B encoder. During reset, running
disparity and data registers are cleared. Also, the 8B/10B encoder outputs a K28.5
pattern from the RD- column continuously until tx_digitalreset is de-asserted. The
input data and control code from the FPGA fabric is ignored during the reset state.
After reset, the 8B/10B encoder starts with a negative disparity (RD-) and transmits
three K28.5 code groups for synchronization before it starts encoding and
transmitting the data on its output.
While tx_digitalreset is asserted, the downstream 8B/10B decoder that receives the
data might observe synchronization or disparity errors.
Figure 1–20
(tx_digitalreset is high), a K28.5- (K28.5 10-bit code group from the RD- column) is
sent continuously until tx_digitalreset is low. Due to some pipelining of the
transmitter channel PCS, some “don’t cares” (10'hxxx) are sent before the three
synchronizing K28.5 code groups. User data follows the third K28.5 code group.
In double-width mode, the 8B/10B encoder operates in a cascaded mode, as shown
on the right side of
and transmitted prior to the MSByte.
In double-width mode, the cascaded 8B/10B encoder generates two 10-bit code
groups from two 8-bit data and their respective control code identifiers.
shows the conversion format. The LSB shown in
clock
Reset Condition
Double-Width Mode
K28.5-
shows the reset behavior of the 8B/10B encoder. When in reset
K28.5-
Figure 1–20 on page
K28.5-
xxx
...
1–25. The LSByte of the input data is encoded
xxx
K28.5-
Figure 1–21
Stratix IV Device Handbook Volume 2: Transceivers
K28.5+
K28.5-
is transmitted first.
Dx.y+
Figure 1–21
1–25