GRSPW datasheet(28/48 Pages) ACTEL

28 / 48 page

GRSPW / GRSPW-FT

December 2008, Version 1.0.2

GAISLER

Table 20. GRSPW time register

RESERVED

TCTRL

TIMECNT

31: 8

RESERVED

7: 6

Time control flags (TCTRL) - The current value of the time control flags. Sent with time-code

resulting from a tick-in. Received control flags are also stored in this register. Reset value: ‘0’.

5: 0

Time counter (TIMECNT) - The current value of the system time counter. It is incremented for each

tick-in and the incremented value is transmitted. The register can also be written directly but the

written value will not be transmitted. Received time-counter values are also stored in this register.

Reset value: ‘0’.

Table 21. GRSPW timer and disconnect register.

22 21

12 11

RESERVED

DISCONNECT

TIMER64

31: 22

RESERVED

21: 12

Disconnect (DISCONNECT) - Used to generate the 850 ns disconnect time period. The disconnect

period is the number is the number of clock cycles in the disconnect register + 3. So to get a 850 ns

period, the smallest number of clock cycles that is greater than or equal to 850 ns should be calcu-

lated and this values - 3 should be stored in the register. Reset value is set with VHDL generics or

with input signals depending on the value of the usegen VHDL generic.

11: 0

6.4 us timer (TIMER64) - Used to generate the 6.4 and 12.8 us time periods. Should be set to the

smallest number of clock cycles that is greater than or equal to 6.4 us. Reset value is set with VHDL

generics or with input signals depending on the value of the usegen VHDL generic.

Table 22. GRSPW dma control register

17 16 15

13 12 11 10

RESERVED

LE RESERVED NS RD RX AT RA TA PR PS AI

TI RE TE

31: 17

RESERVED

Link error disable (LE) - Disable transmitter when a link error occurs. No more packets will be trans-

mitted until the transmitter is enabled again. Reset value: ‘0’.

15: 13

RESERVED

No spill (NS) - If cleared, packets will be discarded when a packet is arriving and there are no active

descriptors. If set, the GRSPW will wait for a descriptor to be activated.

Rx descriptors available (RD) - Set to one, to indicate to the GRSPW that there are enabled descrip-

tors in the descriptor table. Cleared by the GRSPW when it encounters a disabled descriptor: Reset

value: ‘0’.

RX active (RX) - Is set to ‘1’ if a reception to the DMA channel is currently active otherwise it is ‘0’.

Only readable.

Abort TX (AT) - Set to one to abort the currently transmitting packet and disable transmissions. If no

transmission is active the only effect is to disable transmissions. Self clearing. Reset value: ‘0’.

RX AHB error (RA) - An error response was detected on the AHB bus while this receive DMA

channel was accessing the bus. Cleared when written with a one. Reset value: ‘0’.

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