SCD128410QCE Intel, SCD128410QCE Datasheet - Page 153
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SCD128410QCE
Manufacturer Part Number
SCD128410QCE
Description
Manufacturer
Intel
Datasheet
1.SCD128410QCE.pdf
(176 pages)
Specifications of SCD128410QCE
Pin Count
100
Lead Free Status / RoHS Status
Not Compliant
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7.8.13
Datasheet
Register Name: SPR
Register Description: Short Pulse
Access: Read/Write
Bit 7
Bit
7:5
3:2
4
1
0
Short Pulse Register
This register performs two functions,
For non-compatible modes, SPR must be set to n 2, where n is the number of CLKs in a 500-ns
pulse. The peripheral host initializes this register with the appropriate value to generate a 500-ns
pulse width based on the operating frequency of the device. In Compatibility mode, SPR should be
set to the needed length of the ACK* pulse. This is provided to enable the device to interface to
These read-only bits are always ‘0’.
TestMux: When this bit is set, the state of the state machine is multiplexed onto the GPIO pins for debugging
purposes.
GPIO is not possible when this bit is set.
Clear Pause and Set Pause: These commands implement an error pause in Compatibility mode. Usually,
errors are presented to the host parallel port by the peripheral during the active BUSY period of a data
transfer. SetPs remains set until ClrPs is set, at which time both clear.
In most cases, the slave host also sets RevRq at the same time when SetPs is set to:
1) Lockup Compatibility mode with BUSY high, and
2) Request a reverse transfer if the master requests that an additional status be sent in the reverse direction
EPP Interrupt Request: This command causes the state machine to generate the EPP interrupt sequence.
This bit clears on the initiation of the Intr (PerClk) pulse on the parallel port interface.
Reverse Request: This command requests that the host parallel port initiate the defined interface reversal
handshake as defined by the IEEE STD 1284 specification. The command bit clears to indicate completion
after the command executes on the interface. For Reverse Nibble and Reverse Byte modes, this occurs after
negotiation is complete; in ECP mode, it occurs after the Reverse Request signal on the parallel port interface
goes low.
In ECP mode, nPeriphRequest (nFault) is driven low to request that the host-side parallel port reverse the
direction of the interface.
When this bit is set upon termination of Compatibility mode, the CD1284 can indicate that reverse data is
available (through the nDataAv signal) immediately upon recognition of a Reverse Nibble or Reverse Byte
negotiation. To obtain this behavior, this bit should be initialized to ‘1’ and set to ‘1’ upon termination of
Compatibility mode.
•
•
Bit 6
It sets the duration of the short pulse used by the IEEE 1284 protocols for all modes other than
Compatibility;
In Compatibility mode, it sets the duration of the ACK* pulse.
Bit 5
IEEE 1284-Compatible Parallel Interface Controller — CD1284
Bit 4
8-bit Binary Value
Description
Bit 3
Bit 2
Bit 1
8-Bit Hex Address: 26
Default Value: 00
Bit 0
153
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