SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 1286
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SAM3X8E
Manufacturer Part Number
SAM3X8E
Description
Manufacturer
Atmel Corporation
- Current page: 1286 of 1465
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• CLK: MDC clock divider
Set according to system clock speed. This determines by what number system clock is divided to generate MDC. For con-
formance with 802.3, MDC must not exceed 2.5MHz (MDC is only active during MDIO read and write operations).
• RTY: Retry test
Must be set to zero for normal operation. If set to one, the back off between collisions is always one slot time. Setting this
bit to one helps testing the too many retries condition. Also used in the pause frame tests to reduce the pause counters
decrement time from 512 bit times, to every rx_clk cycle.
• PAE: Pause Enable
When set, transmission pauses when a valid pause frame is received.
• RBOF: Receive Buffer Offset
Indicates the number of bytes by which the received data is offset from the start of the first receive buffer.
• RLCE: Receive Length field Checking Enable
When set, frames with measured lengths shorter than their length fields are discarded. Frames containing a type ID in
bytes 13 and 14 — length/type ID = 0600 — are not be counted as length errors.
• DRFCS: Discard Receive FCS
When set, the FCS field of received frames are not be copied to memory.
• EFRHD:
Enable Frames to be received in half-duplex mode while transmitting.
• IRXFCS: Ignore RX FCS
When set, frames with FCS/CRC errors are not rejected and no FCS error statistics are counted. For normal operation, this
bit must be set to 0.
1286
1286
Value
Value
0
1
2
3
0
1
2
3
SAM3X/A
SAM3X/A
OFFSET_0
OFFSET_1
OFFSET_2
OFFSET_3
HCLK_16
HCLK_32
HCLK_64
HCLK_8
Name
Name
Description
MCK divided by 8 (MCK up to 20 MHz).
MCK divided by 16 (MCK up to 40 MHz).
MCK divided by 32 (MCK up to 80 MHz).
MCK divided by 64 (MCK up to 160 MHz).
Description
No offset from start of receive buffer.
One-byte offset from start of receive buffer.
Two-byte offset from start of receive buffer.
Three-byte offset from start of receive buffer.
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
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