POWER MANAGEMENT
CLOCKRUN Protocol
The nCLKRUN pin is not implemented in the LPC47M10x. See the Low Pin Count (LPC) Interface Specification
Section.
LPCPD Protocol
See the Low Pin Count (LPC) Interface Specification Section.
SYNC Protocol
See the Low Pin Count (LPC) Interface Specification Section for a table of valid SYNC values.
Typical Usage
The SYNC pattern is used to add wait states. For read cycles, the LPC47M10x immediately drives the SYNC pattern
upon recognizing the cycle. The host immediately drives the sync pattern for write cycles. If the LPC47M10x needs
to assert wait states, it does so by driving 0101 or 0110 on LAD[3:0] until it is ready, at which point it will drive 0000 or
1001. The LPC47M10x will choose to assert 0101 or 0110, but not switch between the two patterns.
The data (or wait state SYNC) will immediately follow the 0000 or 1001 value.
The SYNC value of 0101 is intended to be used for normal wait states, wherein the cycle will complete within a few
clocks. The LPC47M10x uses a SYNC of 0101 for all wait states in a DMA transfer.
The SYNC value of 0110 is intended to be used where the number of wait states is large. This is provided for EPP
cycles, where the number of wait states could be quite large (>1 microsecond). However, the LPC47M10x uses a
SYNC of 0110 for all wait states in an I/O transfer.
The SYNC value is driven within 3 clocks.
SYNC Timeout
The SYNC value is driven within 3 clocks. If the host observes 3 consecutive clocks without a valid SYNC pattern, it
will abort the cycle.
The LPC47M10x does not assume any particular timeout. When the host is driving SYNC, it may have to insert a
very large number of wait states, depending on PCI latencies and retries.
SYNC Patterns and Maximum Number of SYNCS
If the SYNC pattern is 0101, then the host assumes that the maximum number of SYNCs is 8.
If the SYNC pattern is 0110, then no maximum number of SYNCs is assumed. The LPC47M10x has protection
mechanisms to complete the cycle. This is used for EPP data transfers and should utilize the same timeout
protection that is in EPP.
SYNC Error Indication
The LPC47M10x reports errors via the LAD[3:0] = 1010 SYNC encoding.
If the host was reading data from the LPC47M10x, data will still be transferred in the next two nibbles. This data may
be invalid, but it will be transferred by the LPC47M10x. If the host was writing data to the LPC47M10x, the data had
already been transferred.
In the case of multiple byte cycles, such as memory and DMA cycles, an error SYNC terminates the cycle. Therefore,
if the host is transferring 4 bytes from a device, if the device returns the error SYNC in the first byte, the other three
bytes will not be transferred.
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