How is pattern-match based wake-up where the PC is woken-up when a
certain byte pattern is seen in a network packet implemented in a
wake-on-LAN capable network interface controller? I am not asking
about Magic Packet or directed packet wake-up. Specifically, how is
this byte pattern sent to the controller and how does it match this
pattern against the received packets to generate the wake-up signal to
the PC?

The "pattern" on the receiving end (the NIC) is pre-set to recognize
the pattern and begin the wake-up process. That's why some NIc's are
Wake-On-LAN(WOL) and some are not. The actual wakeup process begins
after the receipt of the pattern, an interrupt is sent to the
mainboard, which powers-up and begins whatever the boot process is
defined as in the BIOS.

Rgards,

Wake-on-LAN (WOL) is a mid-1990s industry standard that makes it
possible for an Ethernet adapter to wake-up a sleeping computer using
a specially-defined WOL packet.

The WOL packet is a standard Ethernet packet with the MAC address of
the target computer repeated sixteen times in the data field. For
example, if the Ethernet address of a target computer is
01:02:03:04:05:06 (6 bytes), then the LAN controller of that machine
should be looking for the following sequence inside the frame:

FFFFFFFFFFFF010203040506010203040506010203040506010203040506
010203040506010203040506010203040506010203040506010203040506
010203040506010203040506010203040506010203040506010203040506
010203040506010203040506


Knowledge of MAC addresses beyond a subnet is virtually impossible.
Thus, sending a WOL packet across multiple subnets - that is, routing
a WOL packet - is not feasible. The WOL packet is also not part of the
existing standard TCP connection establishment packet sequence.

After receiving the packet, the NIC sends a signal to the motherboard
through a Wake-On-LAN cable terminated by a 3-pin connector on each
side. That signal starts the standard booting procedures of the
motherboard BIOS as if you had pressed the power on button.

The motherboard must contain a complementary metal-oxide semiconductor
(CMOS) that is designed to use Wake on LAN technology for this to
work.

Yes, I am familiar with the Wake-On-LAN specification. However, I am
asking about the newer ACPI compatible pattern matched wake-up where
the NIC can be programmed to wake-up on a specific pattern of bytes in
a packet, for example the PC?s hostname. How can the NIC be programmed
to wake-up on a particular sequence and how does the NIC match the
packet data against the pattern?