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Field Name Bits Type Reset Value Description<br />

reserved 31:16 ro 0x0 Reserved<br />

Register (can) ESR<br />

Register ESR Details<br />

Appendix B: Register Details<br />

REC 15:8 ro 0x0 Receive Error Counter<br />

Indicates the Value of the Receive Error Counter.<br />

TEC 7:0 ro 0x0 Transmit Error Counter<br />

Indicates the Value of the Transmit Error Counter.<br />

Name ESR<br />

Relative Address 0x00000014<br />

Absolute Address can0: 0xE0008014<br />

can1: 0xE0009014<br />

Width 32 bits<br />

Access Type mixed<br />

Reset Value 0x00000000<br />

Description Error Status Register<br />

The Error Status Register (ESR) indicates the type of error that has occurred on the bus. If more than one<br />

error occurs, all relevant error flag bits are set in this register. The ESR is a write-to-clear register. Writes to<br />

this register will not set any bits, but will clear the bits that are set.<br />

Field Name Bits Type Reset Value Description<br />

reserved 31:5 rw 0x0 Reserved<br />

ACKER 4 wtc 0x0 ACK Error<br />

Indicates an acknowledgment error.<br />

1 = Indicates an acknowledgment error has<br />

occurred.<br />

0 = Indicates an acknowledgment error has not<br />

occurred on the bus since the last write to this<br />

register.<br />

If this bit is set, writing a 1 clears it.<br />

BERR 3 wtc 0x0 Bit Error<br />

Indicates the received bit is not the same as the<br />

transmitted bit during bus communication.<br />

1 = Indicates a bit error has occurred.<br />

0 = Indicates a bit error has not occurred on the<br />

bus<br />

since the last write to this register.<br />

If this bit is set, writing a 1 clears it.<br />

<strong>Zynq</strong>‐<strong>7000</strong> EPP Technical Reference Manual www.xilinx.com 621<br />

UG585 (v1.2) August 8, 2012

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