DK-DEV-4SGX230N Altera, DK-DEV-4SGX230N Datasheet - Page 63

• 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 3: TriMatrix Embedded Memory Blocks in Stratix IV Devices
Overview
February 2011 Altera Corporation
Error Correction Code (ECC) Support
1
1
Stratix IV M144K blocks have built-in support for error correction code (ECC) when in
×64-wide simple dual-port mode. ECC allows you to detect and correct data errors in
the memory array. The M144K blocks have a single-error-correction
double-error-detection (SECDED) implementation. SECDED can detect and fix a
single bit error in a 64-bit word, or detect two bit errors in a 64-bit word. It cannot
detect three or more errors.
The M144K ECC status is communicated using a three-bit status flag
eccstatus[2..0]. The status flag can be either registered or unregistered. When
registered, it uses the same clock and asynchronous clear signals as the output
registers. When unregistered, it cannot be asynchronously cleared.
Table 3–3
Table 3–3. Truth Table for ECC Status Flags
You cannot use the byte enable feature when ECC is engaged.
Read-during-write “old data mode” is not supported when ECC is engaged.
No error
Single error and fixed
Double error and no fix
Illegal
Illegal
Illegal
Illegal
lists the truth table for the ECC status flags.
Status
eccstatus[2]
0
0
1
0
0
1
1
eccstatus[1]
0
1
0
0
1
0
1
Stratix IV Device Handbook Volume 1
eccstatus[0]
0
1
1
1
0
0
X
3–7