TDC-GPX datasheet(9/54 Pages) AMSCO

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TDC-GPX

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OEN operations – Driving the bus permanently

valid

High-Z

DATA

OEN

OE-F

OE-R

min.

max.

min.

max.

Figure 3

Spec

Description

Min (ns)

Max (ns)

tOE-F

OEN Rise to Data Valid

1.5

tOE-R

OEN Fall to Data Valid

8.5

Note: With OEN = Low the output buffers are driving allthe time, with OEN = High they are driving only during a

read strobe. While writing to the TDC-GPX OEN has to be High.

Fake Reads for speeding up data readout

The maximum data readout rate is limited by the empty flag set time as it is not allowed to read from an empty

FIFO. This can be overcome by a second fake read strobe which is delayed to the read strobe at the TDC-GPX.

ADR

RDN

Data

RD*

Data takeover

Figure 4

1.3.2 16 Bit Mode

The TDC-GPX data bus can be switched from 28 Bit to 16 Bit. This is done writing a 0x0000010 to address 14.

After that all read / write commands have to be done in pairs. When reading the last data from an interface FIFO

the empty flag disappears already with the first read command. Nonetheless it is mandatory to read a second

time.

The first read/write command always refers to the LSW, the second one to the MSW. The highest 4 Bit of the

MSW are not relevant (write) or shall be ignored (read).

ADR

RDN

EF1

EF2

LSW1

MSW1

LSW2

MSW2

Data

Figure 5

Note: See Bug-Report 01 at the end of the datasheet

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